50 ppm Borax

[waterbear]

These are the ones I got:

http://diywatertesting.com/aquachek_borate.html

You are correct in that it is a algae preventer, not an algaecide. I keep making that mistake! oops.

Yes, your pH will go up when you add borax, but then you just add muriatic acid to bring it back down.

Michael

ProTeam Supreme is basically the same thing as borax and identical to Bioguard Optimizer. Proteam recommend addings 10 oz. of muriatic acid per pound of tetraborate to keep the PH from shooting up (this will also create the boric acid/borate secondary buffer system that is supposed to help stabilize the pH) The Proteam Supreme is Sodium Tetraborate Pentahydrate while good old 20 Mule Team is Sodium Tetraborate Decaydrate (twice as many water molecules attached) so the dosing will be different because of the addtional water molecules attached makes it weigh more for the same amount of borates added.

Here are the links to the Proteam Supreme dosing chart and pH control chart (for adding acid)
http://www.proteampoolcare.com/prod_..._DoseChart.pdf
http://www.proteampoolcare.com/prod_...pH%20Chart.pdf

For a 10000 gal pool Proteam is supposed to be dosed at 27 pounds to reach 50 ppm and according to BleachCalc 20 mule team is supposed to be dosed at 10 pounds, 3.5 ounces (163.5 oz) to reach 50 ppm.
Michael, does this sound right to you? That would make borax more concentrated a supplier of borates but I would think you would need more borax weight wise because of the 10 water molecules attached vs. 5 for Supreme.