Calculated your pool volume (3' 10" actual water depth) as 16,000 gallons, for a PF of 7. Each gallon of PLAIN 6% store brand bleach will add 3.5 ppm of chlorine.

So . . . add 5 gallons of bleach tonight! If you can remove all chemicals and mineral cartridges, pour the bleach through your skimmer, to kill algae trapped there. Plan to add 5 gallons tomorrow night, too.

Meanwhile, post your readings, here!