You know, with pH of 8 and no CYA and no chlorine, you can use Tri-Chlor tabs if you have them, or Di-Chlor powder.
Tri-Chlor tabs, especially a lot of them, will lower your pH, raise your CYA and bring up your FC level.
Otherwise:
if you add CYA powder to the skimmer, don't backwash for a week.
To add muriatic acid, I like to take a 5 gallon bucket of water and add between a cup and a quart of acid to THAT first. Wear gloves, goggles and long clothes when you do this. Then you can add the acid mix slowly into the return stream and it will be fine. Finally, rinse the bucket in the pool. You don't want a bolus of Acid sinking down where it can melt your liner.
You will need to shock your pool. Use either the pool calculator or the rule of thumb for how much:
ROT:
1 gallon of 5.25% bleach will add 5.25ppm of chlorine to 10,000 gallons of water.
1 gallon of 6% ultra bleach will add 6ppm of chlorine to 10,000 gallons of water.
3/4 gallon of 6% ultra bleach will add 4.5ppm of chlorine to 10,000 gallons.
For 20,000 gallons double the amount of bleach to get the same results.
To double the PPM added, double the amount of bleach added (to 10,000 gallons).
So, if you want to add 12ppm of chlorine to 20,000 gallons, add 4 gallons of 6% ultra bleach.
Use the rule of thumb to adjust to what you need. If you buy a blue 5 gallon carboy of liquid chlorine rated at 12%, again the rule applies: 1 gallon of 12% will add 12ppm to 10,000 gallons, or 6ppm to 20,000 gallons.
5 gallons of 12% added to 20,000 gallons will add 30ppm of chlorine--unless you have wet, floating jungle it's probably too much.
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