Hi, Sandy,

get that pH down. Use the bleach calc....shoot for 7.2 - 7.4

Ben's kit will measure as much Cl as you'll ever put in the pool....accurately.

If you've used up your bleach, I would buy a tub of Cal Hypo...you need to get your calcium up, too.

Yes, keep your Cl at shock value 'til it virtually stays constant overnight. 18-20 would not be too high in your pool.

One more thing, Sandy.......GET THAT pH DOWN!