Pool suction runs for 15 minutes after backwash

Dabupa

New member
Apr 21, 2022
1
Dallas
Replaced pump and suction actuator a month ago. Pool is 20 years old.

After a backwash, the pool runs as expected. There is a nice flow into hot tub which overflows into pool. However, after about 15 minutes, the flow is significantly reduced. After 1-2 hours, no water is overflowing from hot tub into pool. Pump is almost always still running.

Air builds up quickly (within hour) in the filter, and I let it out. However, this air release does not seem to return the healthy water flow as I hoped/guessed. However, if I backwash, the healthy flow will return, but this is short lived.

The pump cranks at 3450.
Yesterday I got an alarm (BG0021) and the pump turned off.

I just cleaned the filter last week. Guess I should look/clean again (and I will this evening).

The pump basket is clear. Saw some posts on the o-ring. It basically new… and seems to line up correctly as well.

Skimmer basket are clean/no debris. I do notice that both skimmers do initially suck and then are significantly reduced/stop sucking.

So pump is running, but does not seems to pull enough water over time. Could
it be clogged skimmer/drain…. Maybe, but feel like it would show up in the first few minutes after backwash. Fair assumption? I lean toward a ‘hole’ where air is getting to the filter. Have not done the Syrian wrap method… is that legit? What other ways to check for air getting sucked in?
 

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D,

The first thing that pops to mind is algae. If you have algae, even if you can't see it yet, it will quickly clog a DE filter and cause the problems you are having.

Show us the following chemicals levels:

FC
CC
pH
TA
CH
CYA

Show us some current pics of your pool.

Thanks,

Jim R.
 
You could have a small suction leak, that's where the air would come from. A large one could prevent the pump from ever priming but you don't say that is an issue. Pumps do two things simultaneously, they suck and spit. If they can't spit (clogged filter) they can't suck (prime or continue to provide flow).

It really is that simple and, as Jimrahbe says, you could have an algae problem. What type of filter, DE or sand? They both backwash. If DE, what is the condition of the grids? How old? Calcium or oil clogged, both of which can result in very short filter cycles?
 
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