I bought this maybe 2 months ago, it's the intex saltwater and sand filter system. It ran fine (4 hours a day) for a week or two. It's now having a low flow problem. I tried backwashing (then of course rinsing as the manual says), i checked all of the hoses, and the flow sensor, nothing is blocked.
I tried running it again and it had great flow, for maybe 10 min, then I saw the flow sensor 'falling' some, another 10-20 min and it's beeping that there is low flow. The flow sensor was maybe halfway up (to where it should be).

So I can see that it's not a sensor problem, but i have no idea why it keeps loosing flow. It's about to drive me crazy. I've had to have it off for a week now.