Hi, I have a 23K gallon IG Gunite pool that is still covered to keep the leaves out till those Oaks finally drop their last load. I run my pump in the off season on low speed (3/4 HP) about 4 hours / day.

I use Wallmart Bleach that costs me $2.30 / jug. These are the larger size, and are 174 oz, or 5.14 Liter, or 1.36 gallons. That works out to $1.69 / gallon.

With my cover on during the off season, I need about 2 jugs / month, and in the summer months I need about 6 jugs per month. I buy a dozen at a time since that is a nice fit for the grocery cart.

The annual usage is about 50 jugs or about $115. With bleach I never need to shock so long as I keep the TC at 3-5 ppm, and I add Mauratic acid at the rate of 1 gallon per month to keep the PH around 7.5. That is all I do here, water stays crystal clear, and no algae. CYA ~ 50.

When I stopped supporting "Self Chem" I was spending about $100.00 / month during the summer, and my water was often gray, foamy, and algae never died. Sigh!

Jim