Just a note. He said his pool is 18,300 gallons.

According to the pool calculator, you'll need either:

4 gallons 3 quarts or 6.3 (96 oz) jugs of 6% bleach or

5 gallons 2 quarts or 7.2 (96 oz) jugs of 5.25% bleach or

2 gallons 1 quart or 3 (96 oz) jugs of 12.5% liquid chlorine

to get to a shock level of 16 ppm

or

6 gallons 3 quarts or 9 (96 oz) jugs of 5.25% bleach or

6 gallons or 7.9 (96 oz) jugs of 6% bleach or

2 gallons 3 quarts or 3.8 (96 oz) jugs of 12.5% liquid chlorine

to get to a shock level of 20 ppm


The CYA/Chlorine table from Ben recommends shock level of 15 ppm for CYA between 30 and 50 and the table from the pool calculator site recommends shock level of 16 for CYA of 40 and 20 for CYA of 50.

But, since I'm new, and something is obviously consuming your chlorine, I can't be of much help to tell you how much it'll take to get a reading for FC.

Carl, please correct me if I misspoke on anything.