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Pressure keeps rising on my EC75A Hayward perflex. We have back flushed also tried taking the filter apart and soaking it. The pressure rises within 24 hours and suggestions

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SOURCE: I have freestanding Series 8 dishwasher. Lately during the filling cycle water hammer is occurring. How can this be resolved

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Posted on Jan 02, 2017

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SOURCE: No pressure at all on pump gauge

Without knowing your pip and valve layout, it is difficult to assess the stiuation, but it sounds to me as if either a valve that lets the water into the filter is shut, or the filter is full of air and needs to be primed. On some models if you loosen the top ring until the water fills the chamber and starts to overflow that takes care of the problem. But if you cannot tell by looking at the layou if a valve that should be open is closed, or don't know how to prime it, don't run the pump until they can come back.

Posted on May 31, 2009

  • 4 Answers

SOURCE: Hayward eC-40 pump losing pressure very fast

A better way to clean the filter tubes in the EC40 is to remove the filter tube assembly and soak it in a 5 gallon paint pail that is filled with a solution of water and a 20% muriatic acid, available at hardware and home center stores. Be very careful handling the muriatic acid. Don't splash it around.

Mix it in a 1-to-1 ratio with water and soak the assembly for at least 8 hours. Keep the soaking pail out of the reach of kids and animals.

Remove the assembly, properly dispose of the acid mix and refill the pail with clean water. Soak again for 3 to 4 hours, then reassemble your filter.

Some pool guys say it isn't necessary to soak the tubes in clean water because the muriatic acid will not harm the pool water and will reduce the pH if it's too high. I've always soaked them to be safe.

This is a link to the Hayward manual that describes the process:

Posted on Jun 30, 2009

  • 2976 Answers

SOURCE: Do I need a new sand filter psi gauge?

It wouldn't hurt to replace the gauge every few years, since it makes contact with heavily chlorinated water. They are available for less than $10.

Posted on Jul 07, 2009

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SOURCE: I bought a used Hayward Perflex Extended Cycle DE

Here is a link to the hayward manual. Be sure to follow the pre-coating insturctions carefully.
Use only the swimming pool grades of
diatomite, such as:
CELATOM . . . . . . . . . . . Eagle-Picher Industries, Inc.
AQUA-CEL . . . . . . . . . . Johns-Manville Products Corporation
DICALITE 4200 . . . . . . . Grefco, Inc.
WITCO . . . . . . . . . . . . . Witco Corporation
The EC-50 filter uses a 5 lb. (2.3 kgs.) charge of diatomite (D.E.)

Here is a link to the hayward manual for a EC-50 I think its almost the same as the EC-45

Posted on Jul 01, 2010

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1 Answer

Pressure high on pump but cant bump filter-not solid-handle flimsee

These filters need to be taken apart every few months and cleaned out. When you "bump" the filter you are only rearranging the debris that is already inside it.
If the handle seems "flimsy" it may be that part of the mechanism inside has become unattached. Best bet is to open the filter and clean it out. A pool guy can help you with that to verify that the internals are working properly.

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That increase is due to the filter loading up with debris. Is the pool unusually dirty? If there is a lot of dirt and silt in the pool use the "waste" setting on your backwash valve while vacuuming.
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There may be a calcium build up on the fingers, and just cleaning them will not remove the calcium. I would disassemble filter again, then give the fingers an acid bath. Mix about 50 -50 muriatic acid and water and let elements sit in a bucket with the mixture for 15 or 20 minutes, then reassemble and see if this fixes problem. (the quick test is to let the pressure get real high, than add some acid to the skimmer and see if that lowers the pressure at all)

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High psi, low intake and output. That possible?

Thank you for posting your question here on

High pressure at the filter means the water is held up and not able to freely flow thru, hence the rise in pressure. If repeated bumps and refills are not working your filter fabric is clogged. You can try to wash them (again I assume) and if necessary even try acid washing as well. If none of these works you'll need to replace the fabric or the entire assemblies which is usually near the price of just replacing the filter.

If this answer does not fix your problem, please comment with additional details prior to rating the answer. Positive feedback is appreciated once your problem is solved!


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Remove the nuts and bolts around the head of the filter. The top then seperates from the bottom. if the top of the tank is broke you need to remove the black cover and continue disassembly.
Remove the grip from the handle. Usually a squeeze clip to slide grip off. Slide black cover over handle.
Remove bolt holding handle on to bump shaft, might be addtional drift pin that needs to be removed. Tap out with a drift punch.
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