Cartridge filter question

[TX Pool]

I have a question on cleaning cartridge filters.
1. I understand you clean the cartridges with the pressure differential is between 8 to 10 psi.
2. I understand the “clean” pressure is different at the three different speeds my pump can run.
3. When I clean my filter and start it up I have recorded this “clean” differential at the three pump speeds.
4. So do you clean the filter when any one of these hits the 8-10 difference? So for example it might hit the 8-10 differential when running at high speed but after that run time back at low it is hit about the differential.
5. Also is there a max clean pressure when you should change out and get new cartridges?

 

[HermanTX]

The easiest method to keep track of is to use the clean pressure of the speed that is most often used. So if that is your low speed, just track that and when pressure increases 25% above the clean pressure (call that the dirty pressure) then it is time to clean the filter cartridge.

You would change the cartridge if there is a tear, or the rubber seals on each end are failing. Also, if you clean the cartridge and you install it back and the same “dirty” pressure is reached immediately then it may be time to get new cartridge.

 

[mknauss]

Cartridge Filter Use and Care - Further Reading

www.troublefreepool.com

 

[Jimrahbe]

TX,

What size cartridge filter do you have?

I have a large CCP-520 and I clean mine twice a year. The 25% does not make much sense for me, as my normal filter pressure is usually about 1 or 2 lbs.

I see no reason to check your pressure at several speeds. I suggest that you set your speed to say 3,000 or so and use that when comparing clean to dirty.

Thanks,

Jim R.

 

[TX Pool]

TX,

What size cartridge filter do you have?

I have a large CCP-520 and I clean mine twice a year. The 25% does not make much sense for me, as my normal filter pressure is usually about 1 or 2 lbs.

I see no reason to check your pressure at several speeds. I suggest that you set your speed to say 3,000 or so and use that when comparing clean to dirty.

Thanks,

Jim R.

Yes I have the CP-420 so it should last quite a while for the size of my pool.

 

[Jimrahbe]

Tx,

Keep in mind the whole point of having a VS pump is to run it as slow as possible and still get the job done.

The slower you can run it (within reason) the lower your filter pressure will be. I don't suggest running lower than 1,000 RPM.

I personally run 24/7, most of the time at 1200 RPM. But, I don't have a heater, if I did I'd probably have to run at 1500 to 1800..

Thanks,

Jim R.

 

[blackout]

Here in NY, with the pool open 5ish months out of the year, pump running 24/7 at 24 GPM also with a CCP-420, I clean the filter once a year, right before closing, and I’ve never seen my filter pressure even a single PSI above clean on high speed. I use hairnets in the skimmer; I’m sure that helps a little, too.

Cool thing about the VSF is if I’ve been away from the pool for a few days, I have a sense for when the hairnet or main drains need to be cleaned based on looking at the app and seeing the RPM and watts the pump needs to maintain the flow. To me, at least, monitoring this is much more important than ever worrying about my filter pressure gauge. (And I’m lazy to go out to the pad.)

 

[Jejunum]

I don't suggest running lower than 1,000 RPM.

Why not? I run it lower during peak electricity times, but figure I still am getting some water movement (pump says 18 gpm)

 

[TX Pool]

Well I think the way the system is plumbed I will run the pump 24/7 and keep at a low speed. Unless I am missing something if the pump in my system is shutdown overnight it all drains down. The pump starts ok on its prime cycle, but since the air valve on the CF is manual it traps a ton of air in the vessel and this is in conflict with the manual on how to start the CF system where you manually open the air valve. Do folks just ignore this step if they start/stop their system with CF or is there a way to plumb to keep the vessel full ao it does not drain back to pool at shutdown.

 

[Jimrahbe]

Tx,

The system should never drain back into the pool when the pump is off.. You have an air leak somewhere.

Think of it like removing a straw from a glass full of water, with your thumb over the end of the straw. The water stays in the straw, until you remove your thumb.

I suggest that you find that issue and fix it. Turn off the pump and then listen and see if you hear water movement.

Thanks,

Jim R.

 

[TX Pool]

Tx,

The system should never drain back into the pool when the pump is off.. You have an air leak somewhere.

Think of it like removing a straw from a glass full of water, with your thumb over the end of the straw. The water stays in the straw, until you remove your thumb.

I suggest that you find that issue and fix it. Turn off the pump and then listen and see if you hear water movement.

Thanks,

Jim R.

Thanks I will try tonight and see what I can find out on the piping system.

 

[TX Pool]

Thanks for the tip on the air! I was scared to over tighten the fittings that thread into the pump suction and discharge and the suction one was not leaking water but it was loose enough it was letting a lot of air in. I tightened it up and I think that solved 95% or more of the air and will continue to monitor it this weekend.