Once a week or two, I can 'fix" bad water chemistry - but - I want to be more proactive daily.
Debugging a light algae coating, I just had my water read at Leslies:
FAC = 5 ppm (Leslies says this is high and should be 1 to 4 ppm so they want me to add 19 ounces by weight of Leslie's Chlorine Neutralizer)
TAC = 5 ppm
CH = 330 ppm
CYA = 50 ppm (I have three floaters, each with a handful of 3" Costco trichlor pucks)
TA = 130 ppm (Leslies says this is high and should be 80 to 120ppm so they suggest 62 ounces of muriatic acid)
pH = 7.6
TDS = 1,000 ppm
Pho = 500 ppb (Leslies says this is high and should be below 100 ppb)
According to the "Chlorine / CYA Chart", given 50 ppm CYA, my target FC should be 6 ppm.
According to the "Pool Calculator", I need 40 ounces of 12% by volume HASA liquid chlorine to raise the FC from 5 to 6 ppm (for a 38,500 gallon pool).
So, I just added 62 ounces of 28% muriatic acid (according to Leslie's calculation); and I added 40 ounces of HASA liquid chlorine (according to the two troublefree pool recommended tables above).
But, all this is corrective action ... just to get the pool chemistry to where it should have been all along.
Hence, my question (assuming the target of 6 ppm FC is the goal):
Q: How do I figure out what the daily (proactive) maintenance dose should be of liquid chlorine (given I have about five 3" trichlor tablets in each of three floaters, two for the pool and one for the spa)?
Note: A very sunny location (no shade whatsoever); water temperatures about 77°F to about 80°F; almost zero bather load (one swim per day for 5 minutes for one adult).