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📹 How Much D.E. (Diatomaceous Earth) do I Add?
Adding the right amount of D.E. (Diatomaceous Earth) can be challenging as the measurement guides can vary from bag to bag.
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Just wanted to tell you that your articles have been a tremendous help to me over the last couple of years. I got tired of paying big money to have guys come out and do very little. I still have some learning to do but when I am in doubt I can usually find what I am looking for here. Thank you for giving your experience out so freely. Semper Fi
D.E. works great & is the best filter element out there. I never use the fiber stuff – there is just no need for it. D.E. is environmentally friendly although most cities don’t like it going into the street and then the drains out to the Ocean (they will fine you up to $10,000). It needs to go directly into the sewer. Conspiracy theory: it saves them money as they don’t need to charge their filtration as much as they get your used D.E. for free…I hose it off into the grass w/ no ill effects.
I found an easy way to reinstall DE filter pads that needs to be shared. I don’t do articles so perhaps you can add this to one of yours. I was one of those who struggled with getting my Hayward filter pads realigned after taking them off the manifold. There was always one or two that would leak DE back into the pool on completion. I thought one or more may have torn but it turned out the filter pads weren’t seated properly to the manifold. I found it by running the pump in the backwash mode (cover off) and seeing water leaking from several of the connections. After disassembling I turned the manifold upside down, started with the short pad and worked clockwise outside to inside making sure all pads were well seated into the manifold and there correct spacers. The hardest part was getting the long bolt back into the manifold hole and it wasn’t that bad. All in all this was a much easier task than working from the normal position and no leaks or DE back into my pool. As a side note, I almost purchased a new filter set at $100 plus.
I have the sta-rite DE filter and have learned after season 1 of new ownership to stay on the light side of the DE additive. For the first year I was putting the exact amount in lbs. of recommended and I was having all kinds of issues with pump variable speed pump trying to prime properly and basically the DE filter had too much DE and was working too hard. Trying to learn and understand the DE filter I took apart and cleaned the filter 3 times last year, the final time for end of season winter storage. Every time I noticed an absurd amount of sludge and more than adequate coating of the filter. You expect some of the DE to drop to the bottom inside the filter when water is drained from it, but not the amount I had. And it is just nasty stuff. I had to shovel it out of the street this year because where I was cleaning the filter – it didn’t wash away and was like concrete this year. So, now – this year I am doing a couple scoops less and getting great filtration and pump and everything is working as it should.
I’m new to the pool life, and enjoying it! As far as the maintenance and care of my pool, i’m finding your articles invaluable! So, thank you! Question about DE: if DE is such a carcinogen, do cities regulate where you can backwash? When I backwashed onto the street the other day I noticed DE residue in the street and was concerned about the kids who play there. Now maybe there wasn’t that much, but I live in Phoenix, and there are almost 2 million pools here. Doing the math… would you be concerned?
I grew up in NJ but now live in Southern California so that won’t help you much ;). The rule of thumb is that if there is more than two inches of dirt on the bottom the pool needs to be drained (which is rare but sounds like your situation). What type of pool filter do you have and how much stuff is still on the bottom? Also how is your chlorine reading?
If your theory is correct and 6 lbs = 6 scoops, then if you have a 10 lb bag of D.E. – after taking out 6 scoops you should be able to weigh the bag on a scale and it will be 4 lbs in total weight after the 6 scoops. But that is not the case. Since D.E. is a fluffy powder it actually would take a 2 lbs coffee can to equal 1 actual pound of D.E.. So the 1lb pound Aladdin scoop would be 1/2 lb of D.E in each scoop. After taking 12 scoops out of a 10lb bag it will weigh 4 lbs. Confusing as heck 😉
Thanks so much for your articles. They’re really helping as I try to keep this old pool alive, & fight the green & the mosquitoes. Being forced to learn mostly on my own, as I can’t seem to get service folks to call me back. It’s busy time f. that sector, I suppose. I want to get good at this stuff, & maybe even transition to a household chemicals regime eventually, but right now, I need guidance (or maybe it’s hand-holding), even w. the help of your excellent articles. Anyway, thanks.
Not sure what the number means – no one to ask as everyone who designed that filter is 6 ft under. From my experience you will be fine with eight scoops. Maybe you want to start to think about replacing that filter with a nice new modern cartridge filter. I bet that Anthony filter will bring about $50 at the scrap metal place 😉 And you can sell your grids on Ebay for more $
It is understandable that the consumer will not know this – the disclosure that Diatomaceous Earth is mixed with crystaline silica is listed very vaguely. The bag mentions that it contains crystaline silica in varying amounts per bag. Most retail sales associates who don’t use this in the field never read the fine print. It should be listed on the front in large print and not in microscopic print but it is classified as an occupational hazard -i.e pool guys who use a ton of this stuff ;0
It is an excellent profession. In my area there are more accounts than pool service guys. There is little to no competition and the hours are great. I work Mon-Fri from 6:30 am to 2 pm and make lots of money. I sent you a personal message earlier in the week in your Youtube inbox. Please reply to me through there vs the comments section if you can. I can give you further info that way too.
I’ve heard the same think about Cartridge filters too. I just don’t think it works. The grids for a D.E. are made specifically for the D.E. and I don’t think it will do anything in the sand filter since the Lateral in the filter just doesn’t look like it can be coated with the D.E. I don’t see how it will work.
hi, great articles….so helpful. i took apart my pentair 60 plus de filter and cleaned all grids….then put back together. no rips in grids….manifold good…etc. put 6lbs of de as recommended. the question I have is only on the initial adding of de……I get a small amount of de back in…… is it normal to get some de back in pool ? a small amount came back in pool. once I vaccumed…. no more. thanks
D.E. is mixed with crystaline silica. On bag: “Breathing crystaline silica dust (ingredient in D.E) over prolonged time …Inhaled crystaline silica from occupational sources has been classified as carcinogenic to humans (group 1) by the International Agancy for Research of Cancer.” According to the manufacturer once the D.E, gets wet the crystaline silica dust is inert, while it is dry and breathable it is a carcinogen. This stuff in any amount in your lungs is bad, very bad…
Thank you for your article. I always feel that by going by the recommended amounts of D.E. on the package or even on the filter it is just a bit to much. Can you recommend how much D.E. I should use on a Pentair Quad 80 D.E. Filter? Much appreciated. I also liked your advice on backwashing for 1-1.5 minutes. Many others show 2-3 minutes and then repeating the process which really seems excessive. Can you also suggest the amount of D.E. for my Quad 80 to add after doing a backwash? Thanks again!
Thanks for your response to my other question, I have one more question. After the last filter service (grid out) I added 8 cans de. During the add, after 3rd can a brief puff of de came out of the SUCTION HOLES at the bottom of the pool. It stopped and thereafter functioned as normal. No de leaks. Any idea what would cause this unusual occurance? Thanks! I would guess about a qtr to a half CUP of de. The navigator sucked it up. Pool clear next day. One more, I noticed a couple of grids had the internal skeleton cracked but no holes yet. What BRAND do you like for Hayward. I now have Pleatco & they lasted maybe a few years. 🙂 🙂
I have the blue scoop from Leslie’s. A lot of people are saying it only holds ~.75 lb, not 1 lb.. I’m trying to figure out how many scoops I need after a backwash for a 60 sq. ft. Hayward. Your guidelines of 3 to 4 scoops assumes that 1 scoop is 1 lb., so I guess I should be adding closer to 5 scoops. Does that sound right to you?
I’ve been fighting algae, so today I cleaned my 60 sq. ft. filters (also replaced two that had holes) and added 12 scoops of new DE (I hadn’t seen your article yet). Notwithstanding all that cleaning and replacing, after running the pump for several hours, I checked back and the pressure had gone up all the way to the top of the gauge (30 lbs). I don’t understand why cleaned or replaced grids would so quickly lead to such high pressure. I’m at wits end in dealing with this algae — and now having pressure so high I had to shut the whole system down.
I have taken over the care of a children’s summer day camp pool. I am very confused about how much DE to use. The filter is an old stainless steel Purex Triton Nautilus Plus (NPS-72). Obviously it is a 72 Sq. ft. filter. The label on the filter says to add 11 lbs. of DE. however according to your article I should be adding about 14 lbs. The pool gets heavy use. It is 30×50 and holds about 37,000 gallons of water. Can you give me advice about how much DE to use? Thanks for all your articles, I have learned a lot!!
Two questions: Ques. 1) How long should should I let my 60 gal filter run, after I cleaned out my tank, cleaned the grids and added brand new Earth to the filter (10 cups as you suggested)? Ques. 2) You suggested once a month to run the backwash and add about two cups O’ earth in the skimmer. Do I use the valve pressure gauge to ensure I have replaced enough earth?
I have the same question. My Purex 4000 series filter says to put in 6lbs. It looks to be the same filter as the one you are showing here. I have an OceanBlue branded DE scoop that says it is 1lb for each scoop. So I also would assume that 6lbs or 6 scoops is enough using this scoop I have. The 1lb scoop I have looks to be the same size as yours. Makes me think that the Aladdin instructions are a bit off. Could it be dependent on the brand of DE?
For those without a dedicated DE measuring cup: 1 lb of DE by weight = 48 oz in (loose) volume: 6 cups, 3 pints, or 1-1/2 quarts There are rules-of-thumb, but the best rule is to follow what the filter manufacturer says. I have a Hayward ec65a whose filter area is 27 sq ft. If you use the divide-by-6 rule, that’s 4-1/2 lbs; if you use the divide-by-7 rule, that’s just under 4 lbs. However, the manufacturer insists on 6 lbs. So who’s right? The manufacturer, always. That said, after backwashing, best to use 75% to 80% of that total, which is really for a filter completely cleared of all DE. So in this case, it comes down to 4.5 to 4.8 lbs, which is close to the divide-by-6 rule. Voila!
Thank you for your articles. I have a question. I have a Hayward EC65 bump filter that requires as per manual 6 lbs of DE. The filter is 27sq. Your article instructions shows Aladdin scoop states 5 sq = 1 scoop for vertical filters and 1 scoop for 7 1/2 sq for bump filters, (which I have). My question is if the manual of the filter states 6 lbs, am I adding 6 scoops? or as your article calculation 3.6 scoops (3.6x 7.5= 27). My pool is a 16×32 app 21000 gallons. I run a Hayward variable speed pump usually on low speed for 18 hours. I sometimes find my water cloudy too. Try to keep my chemicals in line with pool calculator. Do you think if I upgrade my filter to Pentair Quad 60 will help (twice amount coverage). I like a filter comparable to my variable speed motor high efficiency. Thank again for your help and service.
Thank you so much for the information. I am now confident about caring for my own filter. The simple instruction to determine the square footage of my filter in order to determine the proper amount of DE has eluded me until now. Thank you, thank you, thank you. Next I will search your articles to determine what amount to add (if any) after flushing or backwashing the filter. Big Smiles 🙂
I have an old and i mean old filtering system for an Anthony Pool. A veritcal tank. I just replaced ( and they were hard to find) 5 of the disc filters. When i turned on the filter and cranked the tank handle… a cloud of earth came pouring out of the spout in the pool. This has been a ongoing issue. I cannot vacum the pool because it dumps right back into the pool. I’m totaly frustrated. What could be causing this?
just clean my filter have a pld70 from sta rite after the 5 scoop I saw some DE coming from my return line. its put out like for 2 minutes then stop making my pool almost white I did have it running and it clears up in 2 hours I inspect the filter no problem found .when I clean it . it this normal ??
Hello. Each time I put DE in m pool the DE goes at the bottom of the pool. What do you think the problem is? And I do I know if I have a leak in the filter,I checked my cartridges and they look fine… My pool is getting greener more often and I don’t know why,the level of Florine is fine the filter is clean… Thank’s for reading me. Alain
Apparently DE has a natural component of silica… Osha restatement: “Clarification on Enforcement Policy under the Hazard Communication Standard for Diatomaceous earth. Interestingly enough, they had one positive study and at least one negative study, testing only DE containing less that 1% crystalline silica…one study rules and they have to contain a warning on compounds of DE <1%...they didn't study compounds larger 1% so those DONOT require a warning....weird.
Figuring out how much DE to use Start by noting the PSI reading on the filter with the pump running. Mix 1/4 cup of DE with water in a bucket and pour that slowly into the skimmer. Remove the skimmer sock, if any, before adding DE. Give the system about two minutes to stabilize. Note the pressure on the filter and repeat the second and third steps until the pressure has gone up by one PSI. This will typically take around 1-2 cups of DE.
Hope you’re still monitoring the article. I have a leak at the top of my filter where the pressure gauge screws in. This is my second gauge. Neither one ever seemed to give a true reading it seems. Of course I got both at P a P. I asked them last time if they carry a “heavy duty” or just a better grade gauge and all they offer is the lowest generic brand. Yours looked nice! LOL. Where can I get the right and better one? Mine is a Hayward and the threading comes out the back, not the bottom. Thanks!
I have a new pool that just got concrete. The pool water was extremely dirty when the concrete was finished but was cleaned by one of the guys. When I swim I can see small particles floating in the water. Some I can tell are from the styrofoam and some look like tiny pieces of pool noodle. Is there a chance that I didn’t put enough DE in my filter after I backwashed it last month? I put in 8 32oz cups like the pool man said but I didn’t pack it down. It was loose.
Then what else could that reading mean? “Filter area”, there is no other info on that label that reads anything about filter size other that that. Remember this is a 42 year old system. The model# ID is worn off so I have no clue what model it is. But i so know that it is OLD…and a pain in the ass to clean as i did yesterday and today i am going to tackle the green water…oh boy lucky me.
Have you ever thought about Cellulose Fiber? My company here in Austin has a lot of D.E. filters that don’t have a waste line that leads to the sewers. Most of them have a backwash hose that i extend to a corner of their yard, so it seems cellulose fiber would be better because it is biodegradable and safer for the environment. Have you ever tried using it?
Noticed a few things regarding your article… Unless your DE is mixed with _something_ else, it is not a carcinogen… and if it was, water would have 0 effect on removing that property from it… Now, that doesn’t mean it isn’t dangerous.. Breathing it in is not advisable as it can cause respiratory issues (the Dust that is) If DE was carcinogenic, I some how doubt there would be food grade supply’s of it… Just a friendly note… Great article otherwise!
I have the same question. My Purex 4000 series filter says to put in 6lbs. It looks to be the same filter as the one you are showing here. I have an OceanBlue branded DE scoop that says it is 1lb for each scoop. So I also would assume that 6lbs or 6 scoops is enough using this scoop I have. The 1lb scoop I have looks to be the same size as yours. Makes me think that the Aladdin instructions are a bit off. Could it also be dependent on the brand of DE?
One question, re. a Pentair Nautilus FNS 60: A pool store guy recommended Jack’s Magic Filter Fiber Stuff as DE alternative. It’s touted to require “less than half the amount” of DE, to “extend filter runs,” to reduce filter clogging, be biodegradable, non toxic, and more “environmentally friendly.” Had any experience w. this? I bought it, to use re-starting things after disassembling & cleaning the filter, but then was talked out of using it by a friend, who knows more than I (no expert, tho).
Hey, Thanks for the articles, I clean the filter a purex triton 2000, took the screens out and washed them and after putting everything back together I added the DE but the NO pressure read on the gage, I opened the air valve until water shot out to make sure that all air went out but pressure only went up to 2 psi, this normal?? Any tips?? Thanks
Alright you wanted to thank you, you’re just one of those people that’s very easy to listen to. Lol. I got to the back washing portion of this and BAM, you answered my question. I’ve been dealing with a pool where I think even though I have a new air pump, the guy had been kind of screwing me over that was doing the servicing and he just wore it out too quickly by just not addressing the manifold that he broke and some other things, but anyway, I’ve been learning how this all works and trying to get it down and it looks as though I have an impeller shaft seal that’s leaking and causing some air. perusal you gave me the confidence to not take ppl on their works, alone, and figuring out how it all works. & then repairing it myself! Thanks!
Your advice, while appreciated, isn’t working. I cleaned the filters again (6 out of 8 of which are brand new), added 10 cups DE, attached the Kreepy — and my pressure, FROM THE VERY START, was 18 (instead of, maybe, 8). Within an hour or two it was pushing beyond the top of the gauge (30 lbs). As I mentioned, my filter doesn’t have a backwash capability. So I don’t think it’s a “process”; I think it’s utterly hopeless. I think I’ll have to rent a pump, pump all the green water out, and hope for better luck next time — and then be smart enough never again in my lifetime to buy a house with a pool.
Just changed all the eight Hayward DE6020 filter Grids and add 12 scoops, after 24 hours filtering I think tomorrow I need a backwash and then add 3-4 scoops as you said! BTW I checked leslie’s new DE package, they said for 60sqft need 7lbs and equals 12 scoops. Hope the pool turn clear tomorrow, I let it run 24 hours and add some bags of shock.