Too Much DE Filter Pressure


We have a DE Inground Pool...Problem is:


After running the pump for about 10 minutes, pressure in the DE Filter goes past 20 and the flow out of the return jets almost completely dies out.

We have turned the filter off and pumped the handle and it works good, but in about another 10 minutes, we have the same issue, jet flow dies out.

Fingers have been cleaned and in good condition, check valve is not clogged, etc. We have a Hayward 1.5 hp pump.

Please help...this has been an ongoing issue for 2 yrs. It is also costly on the Electric Bill.




Thanks for the question and beautiful picture

Here are some good posts about this very issue:

Pressure Builds Up In 30 minutes And DE Flowing Back Into The Pool

D.E.Filter High Pressure

A couple of things to consider - Use a real DE scoop and not a coffee can. Using anything other than a DE scoop will give you either too much or too little DE.

Here are my DE pages:

DE Pool Filters

DE Pool Filter Maintenance

Baquacil and similar products can clog up your sand. Also, swimmers that use oils and lotions.

Be sure the impeller is not jammed up with debris. Turn off the breaker, then the pump motor, remove the pump lid and the basket. Stick your fingers in the impeller and remove any debris.

The pump basket and skimmers should be cleaned out and no blockage.

Back wash the filter.

Check the pressure gauge and be sure it's working properly. Many times pool owners will get a false postive on low or high pressure because of a faulty gauge. Turn the system off. Does the needle drop to zero? If it does, the gauge works, if not, replace it.

Check out the page links and visitor questions above. If that doesn't help email back and we'll go from there.

To post a reply, or if you have a similar question, you can see your post on the Q&A page in the "DE Pool Filter" category.

Swimming Pool Questions & Answers

Check back to this post for updates or answers.

Hope this helps and have a great Summer.

Robert

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D.E.Filter High Pressure

by JOSEPH GALLO
(SYDNET NSW AUSTRALIA)

I OWN A POOLRITE XL60 DE FILTER. THE PRESSURE KEEPS RISING TO 100 KPA-SHOULD BE 50 TO 80 KPA HAVE BACKWASHED SEVERAL TIMES PRESSURE COMES OK 50 TO 80 ABOUT 3 HOURS LATER HAVE TO BACKWASH AGAIN.

HAVE CLEANED FILTERS WITH DE CLEANER (PUT DE INTO CONTAINER OF DE CLEANER SOLUTION) EVEN CLEANED DE FILTER IN 4 PARTS POOL ACID TO 10 PARTS WETER STILL HAVE PROBLEM.

FILTERS ARE ONLY 7 YEARS OLD.

HOPE YOU CAN HELP WITH SOME SUGGESTIONS

MANY THANKS

JOSEPH GALLO

Thanks for your question Joseph

First I would ask if the pool has algae? You'll need to backwash when the pressure rises and then add back the DE powder. The Flex Tubes might be clogged with debris. oils, and/ or algae as well.

Are the grids placed correctly in the filter housing? If you've changed out the grids, be sure to put them back correctly. If they're not you might get the DE powder on the outside of the grids and that may cause the pressure issue. Be sure the check the owners manual for the amount of DE you need to add.

You can also take the DE filter grids out and see what the pressure is versus when they're in the filter housing tank. If the pressure goes down, then you have a problem with the filter.

You can also call the manufacturer of the DE filter and they can trouble-shoot with you free of charge. They solve problems like yours all the time.

You can look on your filter and get the name and model and then call the manufacturer.

I suggest you use a degreaser designed for cleaning the DE filter grids. Muriatic acid is very acidic and might cause damage to the grids.

A good degreaser is "Filter Fresh" which can be found at most pool supply stores.

If you don't put the right amount of DE powder in after backwash or after cleaning the grids, the oils and residue in the pool will become embedded in the grids causing clogs and high pressure.

Hope this helps and have a great rest of the Summer

Robert

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DE Filter Doesn't Build Pressure Even When Filter Helper Is Added. It Stays At 13 to 14 lbs.

by David
(Altoona, Pa)

The pool was green when I opened it.

The pH is fine and the hardness was addressed.

I added 4 bottles of shock, 5 pints of sanitizer, and 2.4oz. of algaecide.

The pool turned blue, but couldn't see bottom.

I vacuumed blindly and the pool turned green again.

I had another sample tested and the shock was 0. I was told to add calcium hardness and add Filter Helper to skimmer.

I did that, however, the pressure has stayed the same. In other years I always cleaned the filter because pressure would rise to 20/ 22 lbs.

Any ideas?




Thanks for the question David

I would first ask if you could post your chemical readings (chlorine, pH, alkalinity, hardness) and the size of your pool.

It's a little difficult to help when the question states only what was put in. It may not have been enough, or too much.

Did you use a stabilized or unstabilized form of chlorine? What was the name of it?

Dichlor is stabilized and has the (cyanuric acid/CYA) in it.

If you used an unstabilized chlorine, some of it will consume the algae and some will be eaten up by the heat and sun.

Why were you told to increase the calcium hardness? What was the level before you added it and what is it now?

I believe Filter Helper is a kind of floc, which is used to clear up cloudy water.

It allegedly helps bring particles together to form larger clumps that can be easily vacuumed or filtered out.

Have you cleaned the grids and recharged with fresh DE? How much did you use?

Turn your pump off and check the pressure gauge. If it drops to zero, the gauge is fine.

We can troubleshoot after that.

If the needle is stuck, the gauge is probably bad and needs to be replaced.

To clear up a green pool, you can go here:

Green Water/Algae

Green Pool Water

Swimming Pool Algae

Cloudy Pool Water

Water Testing

Pool Water Testing

Water Testing Kit

If you could contact me with the above information, I'm sure I can help.

There's also great posts and answered questions on the pool Q&A page about clearing up green pools and troubleshooting DE filters:

Swimming Pool Questions and Answers

Robert





Follow Up Comment:

By: Dave
June 13, 2011

I use Baquacil. The pH is 7.7 and the calcium hardness was 100. I added 11 lbs.

The pool size 16 by 32 and the pool volume 17,500 gallons.

The guage seems to be fine.

I have two DE filters and break them down and clean them when pressure increases, however the pressure is staying around 13 lbs.

The filter helper is a flock.

I added six capfulls to the skimmer, slowly, which in past years makes my pressure rise.

Thats why I wonder if I have a suction leak.

Any hints on ways to track that down?




Follow Up Answer:

By: Robert
Date: June 13, 2011

Thanks for the follow up Dave

First, I'd like you to read a question I recently answered in this post about Baquacil:

Swimming Pool Algae With Baquacil Use

I'm not really a big fan of Baquacil products and the above post goes into detail about that.

Your calcium is a bit low at 100ppm. The range you want to hit is between 150 - 250ppm.

By putting in 11lbs. you should be in that range. Allow for 1 complete turnover of the water and retest. A turnover is normally about 8 hours.

If you checked the gauge and it drops to zero when the pump is turned off, then I would suggest this link that I just answered:

Pressure Builds Up In 30 minutes And DE Flowing Back Into The Pool

Be sure you're putting in the correct amount of DE and use a DE scoop, not a coffe can.

Also, make a slurry and put that into the skimmer.

If you scoop DE directly into the skimmer you run the risk of not evenly coating the grids.

Basically you'll have large chunks of DE on the grids.

The following links have very good information:

D.E.Filter High Pressure

How To Clean The DE Filter Grids With Oil & Residue

DE Filter Problem..DE Coming Back Into The Pool..

WHY AM I GETTING DE BACK IN THE POOL?

Concerning a suction side leak, here are good posts that I've answered. The first one is very good:

Water Emptying Out Of My Pool Through Sewer Drain At All Settings...

And the rest:

Why Is Air Getting Into The Sand Filter & Pump?

Sand Filter Draining When In "Filter" Position

Pool Sand Filter Problem..Water Out Of Backwash Pipe

Don't worry about you having a DE filter and some of the above posts are sand filters. The troubleshooting is basically the same, with some minor variations.

Checking the skimmer, water level, pump lid and gasket, that's what I'm referring to.

Hope this helps and let me know how it turns out for you.

Robert

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Pressure Builds Up In 30 minutes And DE Flowing Back Into The Pool

I have tried everything?

Problem - pressure builds up from 20 to 30 psi in about an hour - even after cleaning it.

Also, DE seems to flow back into the pool - filter is fine checked it and all O-rings are good too.

Even the Multivalve O-ring has been replaced.

Thoughts?

Niels




Thanks for the question

First I would want to give your some very similar posts that I've answered:

D.E.Filter High Pressure

How To Clean The DE Filter Grids With Oil & Residue

DE Filter Problem..DE Coming Back Into The Pool..

WHY AM I GETTING DE BACK IN THE POOL?

There's alot of troubleshooting and good information on those pages.

Is the water dirty or in the middle of an algae bloom? This will clog up a DE filter quickly, but it's normal.

A DE filter will catch alot of debris.

When you turn the filter off, DE will fall to the bottom of the filter, off the grids, and some dirt will stay on the bottom of the filter.

The pressure won't rise instantly. It migh be that the filter is dirty and needs to be cleaned.

The pressure will also rise quickly if you put too much DE in the skimmer or if you don't make a slurry out of it.

When you shovel DE in the skimmer, it may not have a chance to coat the entire grid and you'll get uneven coating or chunks on the grids.

Don't bump or backwash, and don't run the pump for a couple of hours. Drain the filter and open it up.

You'll probably see a pretty thick coat of DE on the grids and a couple of inches of DE in the bottom of the filter.

DE Pool Filters

Using this, along with the posts above, should solve your high DE filter pressure.

Have a safe and fun swimming season.

Robert

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