Just wanted to provide an Update.

I ordered those strips and waterbear was right on target for the amount of borax to add.

I am very pleased to report that borax works! I've had to deal with mustard algae every year (I live next to a large marsh full of it). Every year I go through a shock cycle and it never really goes away completely...until this year!

My pool is algae free and crystal clear.....but most importantly...its staying that way without weekly shocking.

Thanks waterbear for the help!