Asking for my new neighbor who is a pool newbie, having issues with his inground pool...

markc99

Active member
May 13, 2013
44
My new neighbor is having some flow issues with his pool pump, and I was hoping to help him out. When we opened it for the season, there was a significant amount of algae to deal with, which he has cleared, but now the flow on the pump seems to be low.

He has removed the cartridges twice and cleaned them off (we estimate they are about 5-6 years old), but within a day the flow has diminished quite a bit.

Here are the particulars of his pool:

18'x36' Inground Pool with Vinyl Liner
Filter = System3 Model = S7M120
Pump = UST1102 = 1 HP
pH = 7.2
FC = 8
CC = 0.5
TA = 30
CYA = 45
CH = 80

I know the TA needs to come up a lot, and I wasn't sure about the CH.

I've heard FLOC could be used to clear the water, but I'm sure that would be another reason to have to clean the cartridges yet again.

I would love to hear thoughts.
 

markc99

Active member
May 13, 2013
44
was a slam completed?

pass the oncl test?
Working on the SLAM now. I tested last night and FC was 7 and CC was 1. It’s still the same this morning, but in checking the CYA chart for FC for slam level, it’s recommending a FC of 16. That seems really high. Wouldn’t that take a long time for that to come down to safe levels for swimming?
 

LoneWolfArcher

Well-known member
May 29, 2019
378
Michigan
I'd suggest new filter cartridges. Mine was that old beginning of last year and was severely compromised.

I think with new cartridges he'd be happy with flow and filtration.
 

mknauss

Mod Squad
TFP Expert
Bronze Supporter
May 3, 2014
33,292
Laughlin, NV
've heard FLOC could be used to clear the water, but I'm sure that would be another reason to have to clean the cartridges yet again.
Floc = which TFP never recommends =-= must be vacuumed to waste. Unless this pool has a special plumbing configuration, they cannot vac to waste. The floc would plug and destroy the cartridge filters immediately.
 

LoneWolfArcher

Well-known member
May 29, 2019
378
Michigan
Floc = which TFP never recommends =-= must be vacuumed to waste. Unless this pool has a special plumbing configuration, they cannot vac to waste. The floc would plug and destroy the cartridge filters immediately.
Please listen to this! Marty saved my pool last year when I was literally minutes away from using FLOC.