You'll definitely want to use small doses of the PO4 remover each time you add water. It doesn't take much phosphate in the water to be 'enough' for the algae to live on. I suspect that the Kem-Tek product may be rather slower acting, which would explain why it doesn't cloud the water so badly.

Your pool is about 400 gallons per inch; a reasonable PO4 remover dose would be 2 tablespoons each time you add an inch of water.

Your calcium is fairly high; use borax rather if you need to raise the pH, to avoid adding carbonates.

And . . . tell me what the water looks like? And whether all traces of algae are gone.

One other thing -- lots of people end up asking about vacations 3 - 4 days before they go. Don't do that -- plan now. I'd recommend having 4 quarts of polyquat on hand. If you add a quart when you leave, and have a neighbor pour a quart in 1/2 way through AND you keep your phosphates low, you should have an excellent chance of returning to a clear pool.