FC and CYA

[Rogue959]

Hi so last season I had no issues yet again thanks to tfp.

One thing I did though was with CYA at around 90-100, I had to run my zodiac ei18 about 12 hours a day at 100% to maintain FC at the high level required during the peak of summer months.

If this season I run CYA 50 would I see a significant decrease in run time to maintain the lower level of FC ?

Thanks

 

[jblizzle]

Doubtful. With a lower CYA, you will lose more FC to the sun, so the SWG might have to run even longer.

Are you sure there was not a low level algae bloom? You ever run an Overnight Chlorine Loss Test?

 

[jblizzle]

Saw you post from last year. Swg output is 0.926 which is a little small for an 18500 pool. It can only add 6ppm of FC to your pool in a day. Normal losses being 2-4ppm per day. So running at 100% for 12 hours would be average.

 

[Rogue959]

Yeah thanks was thinking I might need to get a new swg .

Anyone know a good value brand and recommendation for me ? Size etc?

I’ll have to edit but I think I’m closer to a 15k. Gallon pool