Trying to figure out if an SWCG would be more cost effective than 12.5% liquid chlorine.
After tax, I get a gallon of 12.5% for 4 bucks.
In a 23,000 gallon pool, it takes 1 gallon of 12.5% to raise FC from 0 to 5.6, which is between 4 and 8, the recommended target for a CYA of ~45.
According to frogabog in this post I should expect to lose 50% of my chlorine during the day for a pool that's in direct sunlight with high temps (90-100 when the pool is open)
So, if I'm trying to maintain a target of 5 fc, i need to dose every night to 10 fc.
If this information is correct, every night I should drop to 5 FC, then add a ~gallon of 12.5% to bring me back up to 10, and repeat the next day.
That means that I'm going to spend 5 months (ish) * 30.5 days a month (ish) * 4 (per gallon) = $610 per season on chlorine.
If the pool calc is correct, if i were to install an SWCG, I'd need to get up to 3000-3500 ppm salt - so 17 40 lb bags at 5 bucks a pop, 85 bucks - and i'd have to replenish here and there, but salt tends to stay, right? Plus the cost of the SWCG system, of 500-1000 bucks.
So - based on this math, it looks like that after a year or two, an SWCG is going to be more cost effective - AND less maintenance.
I could also get a cover, and since I already have the cover roller bar dealy, I may go that route too. The problem with this is that the pool already stays a little too warm for my taste, so I'm not sure that a cover is going to do a lot of good - any recommendations for covers that just block the sun and DON'T increase water temp?
Can anyone provide any thoughts on this?