Why is my pressure so low?


New member
Aug 12, 2010
I have a question, but haven't figured this site out totally yet. why , if the impellors arent clogged and i have good flow in a de filter, would I only get about 7 lbs of pressure? could it be too little or too much de?


LifeTime Supporter
Apr 27, 2010
Fleming Island, FL
Re: What we need to know to answer your questions

Hi Davepags and welcome to TFP

Here at TFP there are many different topics where you can post your questions. This particular question you ask is related to our topic section called "Equipment - Build, Use, and Repair". In that section there is a subsection called "Pumping Station". You get to the topic section by going to the main TFP website. At the top you will notice a white bar and in that bar is a link labled "Board Index". Click on board index and scroll down a bit and you will see the sections I am refering to. You can ask this question there if you wish or wait till a moderator comes along and moves your post. It won't take very long.

Again, welcome!


Mod Squad
TFP Expert
Apr 4, 2007
SW Indiana
Welcome to TFP.

Two possibilities come to mind. First is a bad pressure gauge. They aren't very dependable. Second is a lack of water coming into the pump. Is the pump strainer basket full with no bubbles?

Bama Rambler

Mod Squad
TFP Expert
LifeTime Supporter
Jun 22, 2009
SouthWest Alabama
And third, a huge filter and a small pump. Your pressure could be perfectly normal for your system.

We really need to know more about your equipment and layout do determine if there is a problem.


Well-known member
Mar 17, 2010
Spring, TX
When I clean my filter by backwashing, mine drops down between 0-10, so around 5-7. When I did a total take apart and clean of my DE filter, I got down around 4.


Well-known member
Jun 12, 2010
mynewpool said:
When I clean my filter by backwashing, mine drops down between 0-10, so around 5-7. When I did a total take apart and clean of my DE filter, I got down around 4.
Yes, exactly. I have a 3/4HP pump, and a 65sqft DE filter. Normal running pressure is about 10PSI, and I bump it at 15. If I manually clean the filter tubes and reassemble, it will get down to 5psi.


LifeTime Supporter
Aug 20, 2009
North Central Texas
I'm using Aqua Pearl, similar to DE but without the silica, in my big Quad filter, 80 sq ft. It is backwashing out better than cellulose did. When I backwash and run pump on the usual, 19-20 gpm, which is pretty low flow, after backwashing the psi is 3-5. When I take filter apart and clean, it is just a little under 3. If I increase the pump speed psi is higher than that and goes up as I run the pump faster. Any of the three common filter media for a DE filter, cellulose, DE, or Aqua Pearl, all give a just below 3 psi when the filter is opened and cleaned when filtering at 19-20 gpm.

I'm not sure what the ball park figure would be in terms of comparing the 10-20 gpm to a certain HP, and/or fixed speed pump. I do not have very high head on the system.

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