Will adding borax to 50ppm kill Mustard algae

[fuelman]

If you would post a full set of test results I could make a better recommendation.

Waterbear,
here are my numbers;
TC-3.0PPM
FC-3.0PPM
CC-0.0PPM
PH-7.8
TA-125PPM
CH-175PPM
STA.-50PPM
TDS-3600PPM
SALT-2500PPM
PHOS-500

That TDS & PHOS level is kinda high ain't they?
The water has a salty taste to it.
What do you recommend?
oh, by the way, my sig."Man!,this water is cold! is just me trying to be funny.