Since pool was built we have been using tricolor tabs with auto in line feeder.
Yesterday 1st results
FC: 1
CC: .5
CH:300 Ppm
TA:90
CYA:100
Ph:7.6
Don't know how to empty water or drain...
21,000 gallons (pool and spa), IG, pebble tec, filter: cartridge, pentair clean&clear plus CCP520...