Filter pressure too high even after manually cleaning grids.

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C

cluelesspoolfool

Member
Jan 31, 2024
15
LA
Hello, I have a pentair 4000 and when I first moved in and cleaned the grids manually the starting pressure was around 20.

Now a month later it creeped up to around 29, so I cleaned it again and now its pressure is 25 PSI.

The flow seems fine and I did the circulation checks and didn't spot any issues. Any idea what could be causing the increase in pressure? All the water chemical levels are fine as well.

Things I tried from online research.

Opened the gauge and made sure water came out.

Double checked skimmer and pump baskets.

Thanks!
 
When the pump is off, does the pressure gauge return to ZERO? Always good to ensure the gauge is not faulty before tearing into the filter.
When you say “I cleaned it again” does that mean that you disassembled it or was it a backwash?
Also, when you originally cleaned it and the pressure was 20psi, was that after you added the DE?
With DE filters, it is important to always compare pressures with DE in the filter.
 
HermanTX said:
When the pump is off, does the pressure gauge return to ZERO? Always good to ensure the gauge is not faulty before tearing into the filter.
When you say “I cleaned it again” does that mean that you disassembled it or was it a backwash?
Also, when you originally cleaned it and the pressure was 20psi, was that after you added the DE?
With DE filters, it is important to always compare pressures with DE in the filter.
Click to expand...
Hello!

The pressure gauge does return to zero.
I diassembled the filter, cleaned the grids and added the manufacturer's recommended amount of DE.
Correct, that previous reading of 20 PSI was after adding DE and running the pool filter for 24 hours.
 
cluelesspoolfool said:
CC - 7.5
FC - .5

Taylor 2006 kit

Now that I'm looking at it, maybe the FC is too low and there is algae that is causing the filter to be clogged?
Click to expand...
Are these accurate or are the numbers reversed i.e FC is 7.5 and CC is 0.5?
If not then algae is the answer. Suggest you do
Overnight Chlorine Loss Test to confirm.

Everything else looks correct with regard to accurate pressure gauge, cleaning grids and adding DE.
Your CH is a little high but that does not affect the backpressure in your filter.
Also confirm there are no downstream restrictions after the filter.
 
HermanTX said:
Are these accurate or are the numbers reversed i.e FC is 7.5 and CC is 0.5?
If not then algae is the answer. Suggest you do
Overnight Chlorine Loss Test to confirm.

Everything else looks correct with regard to accurate pressure gauge, cleaning grids and adding DE.
Your CH is a little high but that does not affect the backpressure in your filter.
Also confirm there are no downstream restrictions after the filter.
Click to expand...
Got it, I think algae is most likely the culprit. Thank you so much!
 
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