Blue film on pool water

[PoolDoc]

pH increaser = soda ash = sodium carbonate
borax = sodium tetraborate (various)-hydrate => 20 Mule Team borax in the detergent section, white box.

[CarlD]

And pH Increaser is just an expensive package for A&H Washing Soda (in the yellow box, frequently right next to the 20 Mule Team Borax in your supermarket's laundry section).

Carl