Question about Pentair 3/4HP Pinnacle High Performance Inground Pool Pump

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De filter pressure too high water is cloudy - Pentair 3/4HP Pinnacle High Performance Inground Pool Pump

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Don't forget to recharge filter with D.E. after backwashing.

Posted on Oct 30, 2009

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Backwash the filter from main drain until sight glass is clear-this will reduce filter pressure. After backwashing return gate valve to filter position, then filter from main drain only. check water chemistry. add a clarifier to water

Posted on Aug 23, 2009

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SOURCE: Pressure on the EC65 is always high

Certainly sounds like a filter problem. Here's a couple of things to try.#1. i don't know how you cleaned the filters but clean them again with a good filter cleaner/degreaser.#2. After a good cleaning, get a bucket large enough to hold the filter fingers in and give them an acid bath. They recommend a 20 to 1 ratio of water to acid (muriatic) but I personally don' think thats strong enough. Use a good amount of acid and let the fingers soak for a good ten or fifteen minutes. (always add acid to water, not water to acid) Rinse and reassemble filter. If that does'nt solve problem, I think it's time to replace filter.

Posted on Jun 17, 2010

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1 Answer

Breathing tube clogs within a day or 2 after cleaning. Pool water is clear and clean but psi goes from 10 to 15 in 2 days.


have you done a total clean on the filter? over time DE can build up in the bottom of the filter tank and significantly reduce filter are causing high pressures.
see if you can pull the bottom drain plug and remove the lid of the filter (do this on a shady day or in low light conditions) grids do not like sunlight and will shorten their life. rinse out the filter's base with a garden hose.
OR if the pool is dirty it will take time to clean it you will need to continuously flush the filter until pressures drop

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Hayward pro series 220 not working. On filter mode continuously and pressure never goes up. Return pressure stays strong. water stays cloudy. I have changed sand, down pipe and now the multiport. Basi


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Hello Kiran - Often cloudy water is caused because the water was not purged. Try purging the water lines by running water through the filter for a total of 3 minutes. This can be done either in one big bucket or in various cups. If the water remains cloudy, then I highly suggest verifying that the filter is in good conditions with no cracks or damages. If the filter is working, then I recommend checking your tap water. If these troubleshooting steps prove ineffective, you may wish to contact a professional as the unit may possibly have an issue within the refrigerator lines.

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Cloudy water is the bane of sand filters!. I suggest letting filter run day and night. Do not backwash until the pressure rises 8 - 10 pounds above clean starting pressure. Do not try to vacuum or stir up the sediment. when water clears, vacuum to waste. Keep the hose running while vacuuming. A dirty filter is a better filter (up to a point). At a higher pressure the filter will trap more of the fine particles that are clouding your water.

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Have a pentair ccp320 filter.brand new last year.pool water has been cloudy for two weeks.water is balancedexcept akalinity is high at 200.suspect filter problems.water was clear for a month.cleaned...


Total alkalinity can be lowered by adding muriatic acid or sodium bisulfate. Acid may be added in doses of up to 1 quart per 10,000 gallons. Total alkalinity tests and further required additions of acid can be made every 2 hours.

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Pressure increase over the red line on pressure gauge while we were away for a weekend. Now pool is cloudy white. I am assuming this is DE. Back washed and cleaned filter twice. However, after running...


When the pressure goes up, try this. Pour some muriatic acid in the skimmer. (about 1/2 bottle) Let pump run for a little bit,(long enough for acid to get into filter)then shut off pump for 5 minutes or so. If pressure goes down to where it should be when it's turned back on, it needs to be disassembled and cleaned and then acid washed.

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1 Answer

Pressure on the EC65 is always high


Certainly sounds like a filter problem. Here's a couple of things to try.#1. i don't know how you cleaned the filters but clean them again with a good filter cleaner/degreaser.#2. After a good cleaning, get a bucket large enough to hold the filter fingers in and give them an acid bath. They recommend a 20 to 1 ratio of water to acid (muriatic) but I personally don' think thats strong enough. Use a good amount of acid and let the fingers soak for a good ten or fifteen minutes. (always add acid to water, not water to acid) Rinse and reassemble filter. If that does'nt solve problem, I think it's time to replace filter.

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2 Answers

Pressure doesn't last & seems to blow out cloudy, dingy water


if you are on city treated water, sand will last aprox. 7 years, if on well water typically 3 - 5 years. so yes, could be a sand issue. also, double check that the there is no water trickling out the backwash / drain outlet of the filter, this could indicate that the diverter valve gasket (spider gasket) could be worn and cause sand from the filter to flow to the pool. this is a common problem if you move the position selector often with the pump still running - the pump should always be off when moving the handle. good luck!

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