Cartridge Filter Pressure

by Phil

I have a Sta Rite cartridge filter. I can not get the pressure below 19.

Even if I remove the cartridge the pressure remains the same.

I know the pressure should be around 8 to 10.

Thanks for the question Phil

Cartridge filters are my favorite and are pretty straight forward, so here are some trouble shooting tips for you to look at.

- First, is the gauge working? Easy way to find out is turn the pump off. If the needle drops to zero, it's fine. If it sticks, replace the gauge.

- Next, be sure the pump lid is seated correctly and the gasket is in good shape. Air might be getting into the system.

- Be sure to bleed the air out of the filter tank.

- When you turn the pump motor off is there any backward flow out the skimmer? There may be a large air bubble caught in the system causing the pressure to rise.

- Be sure all valves are placed in the proper positions. You want the right amount of flow going through each valve.

- Normally the pressure will rise when the pump has to work harder for the water to flow through the system. This might mean blockage somewhere.

- Be sure the bottom drain, skimmer(s), and pump motor basket are all free of debris

- Be sure the impeller is not jammed up with debris. Turn off the pump motor, then the breaker box, remove the pump lid and the basket. Stick your fingers in the impeller and remove any debris.

- Are there any leaks around the pump motor or filter? This could indicate a suction or return side leak.

- Is the pool losing water? You could have a leak in the underground piping, if you have an inground pool. Leaks in above ground pool are easier to detect.

Hope this helps and let me know how it turns out for you.


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Pressure Rises Quickly

by Mark
(Boston, mass)

I washed my filter cartridges and restarted my filter and the pressure is back to normal at 10. After vacuuming my pool for about 20-30 minutes the pressure rises to 25-30 and the filters are dirty again requiring another cleaning.

Please keep in mind that my pool floor is very dirty as it was not opened last season. This is making cleaning take a very very long time.

The filters are about 4 years old. I have a sta-rite system 3 model s7m400 filter system. I don't know if this is due to the cartridges being old and ready to be replaced. The replacement cartridges cost around $500. Any help would be appreciated.

Thanks for the question Mark

What you're experiencing is not out of the ordinary. I'm not going to tell you anything you don't already know, but just to lay it out there.

You start with a clean filter. As the filter gets dirty there's less "clean" room for the water to pass through. This causes a rise in the psi because it takes more force to push water through a smaller/dirty area.

When taken care of, cartridge filters can last for years. Unless there's a tear in the pleats, severely clogged, or the band around the filter is broken there's rarely a need to replace it.

You're spraying the filter when it gets dirty, but you can take it a step further. Really clean it out. What I used on my pool route and for the YMCA pool filters is called GLB Filter Fresh.

Spray the filters off and put in a large container such as a garbage can. Fill with water and add the Filter Fresh per directions on the bottle. Let them soak for about 24 hours, spray off and hook everything back up again. I like to use the GLB line and have used it for years. Be sure to read the directions carefully and follow them. Too much GLB can damage the filter.

Do you have a sectioned hose or a full line one? If it's sectioned I'd use a leaf canister. This keeps the larger debris out of the skimmer line and the pump pot basket.

Also be sure the psi gauge is working. Simply turn the system off. If the gauge needle drops to zero and jumps back up when the system turns back on the gauge is working. If the needle sticks it's time to replace the gauge.

Other than that, and assuming the cartridges are working without any holes or rips, you simply need to keep vacuuming and spraying them out.

I hope this has answered your question to your satisfaction.

To post a reply, or if you have a similar question, you can see your post on the Q&A page in the "Cartridge Filters" category.

Check back to this post for updates or answers.

If you feel your situation is more complex and want immediate assistance (within 24 hrs) you can make a donation of your choice and I'll answer your questions by phone.

Have I helped you find a solution to your pool problems? Did this information help you? Please consider making a donation to help keep this site going. Thank you.

Have a great Summer.


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Pressure Gauge Noise On Cartridge Filter Unit

When taking cartridge filter out to clean and replacing and filling with water and opening valve to let excess air out and then turning pump on, the pressure gauge rattles and makes a very loud vibration.

Does not make noise every time, but most times.

I have taken filter in and out 3-5 times and putting it back in and still the loud pressure gauge noise.

I have even purchased a new gauge and installed and still having the noise issue.

The filter is less than 2 years old and in great shape.

Thanks for the question

I'm wondering if it's actually the water pressure in the filter and not necessarily the gauge itself.

This can happen when you have a suction side leak.

But let's say everything checks out alright and it is the gauge.

On thing is to check the end for a small O-ring. It's about the size of the end of your pinky finger.

If it's missing, you can replace it.

Also, try some white plumbing tape around the threads.

Be sure you just snug the gauge, don't make it too tight.

Check around the hole that the gauge fits into for cracks. It may not be evenly seated.

Did this happen last year? If it didn't, you can ask yourself if there's anything different you've done this year as opposed to last year.

Unfortunately, if the filter is cracked or broken, there's really no easy fix.

If you have any additional questions or would like to comment on your post, you can find it at the bottom of the Swimming Pool Filter Cartridge page and the Q&A page in the "Cartridge Filters" category:

Swimming Pool Questions and Answers

Hope this helps and let me know how it turns out for you.


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Is This A Filter Problem Or What?

by Joe
(Pittsburgh, PA )

When i open up the housing the filter is green and foamy only on the top of the filter. We have been trying to get the green out for days. We even are using a brand new filter. It is an above ground pool and a cartridge filter. We have had a pool for 15 years. This is the most trouble we have ever had.

Thanks for the question Joe

It's good that you have a new cartridge. You cannot clean a green pool with a dirty filter. The pool's filtration system must be working perfectly in order to clear up the water. That's the first step.

The 2nd is I'd like to have your complete chemical readings, the actual numbers:

Chlorine, CYA (cyanuric acid/stabilizer), pH, Alkalinity, Calcium Hardness, and Metals (iron and copper) and names of any algaecides you may have used along with clarifiers, phosphate removers, and/or flocs. It makes troubleshooting much easier and the process of clearing up your pool will go much faster. Green water is a symptom of the problem, not the problem itself.

If you feel your situation is more complex than this, I do phone consultations. It makes things go much faster and many people have found it extremely beneficial, saving them time and money in the long run. All your questions will be answered. I have nothing to sell you so you know I'm not bias.

Pool Consultation

Swimming Pool Care eBook

How To Clear Up A Green Pool eBook


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