High pool filter pressure

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Drb1

Drb1

Member
Jul 11, 2020
23
Buffalo New York
After a backwash and new DE media I now have high pressure in the filter within a week. I also use a variable pump which I mainly run on low speeds. I have always been able to run the lowest speeds with no flow problems since I've had this setup. The problem I am having is after a while on the low speed the flow is so low that my SWG quits producing chlorine due to low flow. I backwashed and replaced media yesterday and the problem occur again within 12 hrs. Today after backwashing I took the filter apart and cleaned looking for a blockage but found none. The PSI now has been starting close to 20PSI. In the past it would of been around 14. I took some pics and have a few ?'s. The first pic of the filter shows the [finger], should it be covered with that hard yellow plastic? Does it even matter? The second pic shows me blowing air tru the elements with a vacuum. Should they bellow up like that? Is air bigger than water? I would think if air has a problem getting tru then so would water. Any help or suggestionsIMG_2161.jpgIMG_2164.jpgIMG_2162.jpg would be appreciated.
 

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Just clean grids and they were very clean. Just started pool back up, on high speed psi was 16 with no media and 17 after I put the earth in. Med Speed is 10 psi and low speed = 4 psi. Both readings with the media in. Grids were clean with just hose. Any thoughts on the grids filling up and holding air like the pic showed?

Thanks
Daren
 
I agree with @ajw22 - sounds like a developing algae problem. I had the same issue several years ago and it turned out to be my first algae bloom I’d ever had, when is why I mistakenly thought it was a filter problem. The water looked clear. After taking the grids into a Leslie’s and having them confirm that they were fine, I did a SLAM and problem was solved.
 
Drb1 said:
Just clean by hosing off. Is there a recommended product for cleaning? Prefer not to use Murtic Acid.
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Hosing off your grids is really all you need to do, assuming you have a sprayer that lets you get down in between each one (which also assumes you’re not disassembling them.) I’ve used a spray-on degreaser from time to time, but found it unnecessary for my pool.
 
AKS Maine said:
Is there anything we need to do when cleaning the filter fingers other than hosing off and cleaning out the tank? Is acid washing necessary?
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Hosing off works fine for my filter. I’ve never even considered an acid wash, as I don’t know that the media can take anything as harsh as acid. I’ve used a spray-on degreaser before, but it’s not really necessary, at least for my pool. If we have a party and there’s lots of swimmers with lots of sunscreen, I might use it.
 
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