Keep it simple.

Have him add 1 gallon of bleach every other night--that should be fine.

You'll probably have to phone him to remind him, too.

Summer I turned 19 I spent the first half roaming all over Westchester and Putnam Counties north of NYC fixing sewing machines for Singer. Second half I spent working as a stage hand for the NY Shakespeare Festival's Mobile Theater--"What The Winesellers Buy" was the show (not Shakespeare). Got to see ALL the worst sections of NYC...and most of the Subway and Bus system.

That was 1974.