DE Filter Pressure Issues

by Mike
(Chapel, FL)

My saltwater DE pool filter starts out at 10-12 psi and moves to 30-35 psi with in about 30 minutes.


I have a 15' by 30' in ground pool in a house I just purchased a week ago. It was full of green algae and we have taken care of that issue but all of the grids in the filter were torn. Levels in the pool now are good but since the filter screens were torn, there was DE all over the bottom and sides of pool.

Here is what I have done so far:

- Equaled out the levels in the pool,
- Bought and exchanged all screens, Bought a Hayward XL pool vac,
- Back washed several times,
- I have also taken the filter apart numerous times and completely cleaned the new screens.

Now, I have not been putting new DE powder into the skimmer because it is all over the bottom and I assume that it will be sucked into the filter and stick to the screens itself.

After running my vac a bit, DE/sediment starts to run out the returns and coating the pool floor and walls again. I think, after reading some of your other replies, that may be due to the screen thing on the manifold keeps blowing off.

Everything seems to be fine until the pressure builds up, all returns run fine, vacuum and skimmer run great. When the psi hits about 32, the returns slow almost to a stop and a few minutes later, a high wheeze emits from the pump or filter. I have looks for leaks but I was unable to find any.

Let me know if I am doing anything wrong please and thanks!




Thanks for the question Mike

High pressure on a DE filter can be troublesome and sometimes hard to pinpoint. The filter themselves are pretty straight forward. Thanks for looking over related questions on the Q&A page. Here are some I'd encourage you to review:

DE Filter Needs To Be Backwashed Every Hour

Too Much DE Filter Pressure

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

- A few things to consider: Be sure the pump motor impeller is not clogged. Turn the breaker off and the pump motor. Remove the pump basket and stick your fingers into the pump. The impeller should spin freely. Also be sure the gasket around the pump lid is good. If it's cracked, broken, squashed/squeezed, you need to replace it.

- 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.

- If you have a Multiport valve, check the spider gasket.

- Make a slurry of DE BEFORE putting it in the skimmer. Many people just dump the DE in. This can cause big chunks of DE sticking to the grids. If 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.

- And always be sure the grids are free of tears and/or rips. This is 99% why DE goes back into the pool.

I'd like to have your complete chemical readings:

Chlorine, CYA (cyanuric acid/stabilizer), pH, Alkalinity, Calcium Hardness, and Metals (iron and copper). It makes troubleshooting much easier.

If the issue is not a mechanical one, such as a clogged impeller or torn grids, algae might the the cause. Dead algae will clog up a filter pretty quickly, especially a DE filter because they catch almost everything.

Hope this helps and have a great Summer.

Robert

Click here to post comments

Return to DE Pool Filter Maintenance.

DE Pool Filter Not Working

by Cynthia
(New Jersey)

We have back washed the DE filter, cleaned the rods and STILL the pressure is 30!!!

Not sure what else we can do.

Had a phosphate issue, that started this "fun" any thoughts?




Thanks for the question Cynthia

First I'll direct your attention to these posts. They're about high DE pressure issues:

DE Filter Pressure Issues

Too Much DE Filter Pressure

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.

DE Pool Filters

DE Pool Filter Maintenance

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.

Concerning your phosphate issue, well, don't be concerned about it. Phosphates are food for algae, but if you keep the chlorine between 1.5 - 3.5ppm and the stabilizer between 30 - 50ppm there won't be any algae, and that's what you want, no algae.

Here's a good post about that. It's a little long, but well worth the read. Be sure to read the comments as well:

High Phosphates Over 1000 & Cloudy Water

Check back to this post for updates or answers.

If you need immediate assistance (within 24 hrs) or for emergency personal assistance, you can make a donation of your choice and I'll answer your questions by phone.

Contact Me

Donation

Hope this helps and have a great Summer.

Robert

Click here to post comments

Return to DE Pool Filter Maintenance.

Mobile & Desktop eBooks 

swimming pool care, basic pool care, above ground pool maintenance, inground, salt water

Click Here To Learn How This eBook Can Save You TONS Of Time & Money

Click Here To Learn The Best Way To Clear Up Your Pool 

Recent Articles

  1. Ionizer Put Too Much Copper In My Pool

    I set my ionizer to "HI" and put too much copper in my pool.

    Read More

  2. How Do You Remove Stains Due To Calcium Hardness Being Too Low

    While we were away a Good Samaritan neighbor turned the water on into our pool to replace evaporation loss but forgot to turn it off again.

    Read More

  3. Low pressure in Cartridge Filter

    My filtering system is about 7 yrs old. It has a Pantera PCF 150 cartridge filter (actually uses 2 stacked PCF 75's ).

    Read More