Please check my reasoning! Bear with the long-ish description:
My SWCG is undersized: 25k unit in a 33k pool. It’s also getting old (5yrs) so I’m researching a replacement. I’m trying to determine optimal cell size given the needs.
A caveat is that the big 2.25total hp pump easily keeps the pool clean and filtered in 4hrs of runtime. It adds substantial cost to run the pump extra hours just to let the SWCG keep up.
1ppm Cl = 3.8g of Cl per 1,000gal
Thus, 33k pool needs 125g Cl to raise the FC 1ppm
Assume the SWCG needs to generate 3ppm/day given load & sunlight (reasonable?)
125gx3 = 375g Cl to be generated per day
Biggest easily available SWCG I can find is the CompuPool 60k model, which generates 46g/hr. This puts runtime at 8hrs to generate 375g Cl, much longer than the pump needs for filtering/cleaning. An option is to replace the pump motor with a 2spd model to enable longer runtime with lower utility cost. Timer (basic on/off mechanical) would also have to be replaced to enable the cleaner to work at high speed for an hour or 2, then switch to low speed. I’ve not yet put the dollar sign together on this.
Any feedback or suggestions? Thanks!