Bestway Flowclear 1500 Sand filter issues, backflow loss of pressure

wolf party

Member
May 18, 2024
16
FL
Pool Size
6000
Surface
Vinyl
Chlorine
Liquid Chlorine
I have the Bestway pool kit from Sam's Club that comes with the 1500 GPH sand pump. I believe it's this one. Flowclear 1500 gal. Sand Filter Pump
I have had mustard algae on and off. Sometimes because of my own laziness, but not now. I've done a SLAM and maintained more than adequate levels of FC for my parameters, but once again my pool is covered in yellow. More about that here.

I have noticed lately that when I backwash, the water comes out at normal pressure for a few seconds and then rapidly drops off and the pitch of the motor increases like there's lots of resistance. All the other settings seem to be fine, it's just on backwash. I don't know if this is a problem, or if it's related to my algae issues (poor circulation?). The pressure gauge is working normally and the numbers (clean vs dirty) haven't changed.

The circulation flow on these pools is bad by design of the inlet and outlet being right next to each other. I have to block off the closer outlet and run it all through the (in pool) skimmer or else it doesn't work very well. This doesn't help the circulation pattern issue but I also don't think it should be so bad that I have mustard algae 24/7.

I will have to open it up and check it out, but I don't even know what I'm looking for. Any advice would be appreciated.
 
Oh my goodness - when they say you need to regularly deep clean your sand filter, they mean it. Between ant nuptial flights and oak flower season, it was totally clogged up. It took 10 minutes just to flush out my puny 20lb of sand with the garden hose.

I checked the gasket on the multiport as well as the pump impeller and everything looked fine. I'm just an idiot. :p Hopefully this was causing my flow/circulation and subsequent algae issues.