Sorry Carl. I tried to give all the relevant info. I did say 28k vinyl. 28000 gallons that is. Also the bleach 8.25 percent sodium hypochlorite from walmart. The shock is from walmart as well "pool essentials" and is trichlor. I am testing with the Taylor kit as recommended here, don't remember the exact numbers of the kit, but uses 5 drops 0001 and 5 drops 0002. You know the one that turns pink rather than the cheaper ones that turn yellow.