My spa is quite new (three weeks) and we have chosen to use hydrogen peroxide. At the moment the water is clear. I purchased some H2O2 test strips and "AuqaChek" test strips. I have so far been dosing the tub with 250ml of H2O2 per week and have added 1 tsp of copper sulphate. There is an ozonator which we purchased as well and has been installed. After dosing the tub on Sat.Oct 5/13 with 250ml and then testing on Oct 8 my ph is high 8.4 or greater, total alkalinity is 80, of course nothing is registering on free chlorine and stabilizer is registering as low. Hydrogen peroxide registered as 0. Last night I dosed again with 250ml and just checked and again H2O2 is O. I am not sure why the H2O2 is disappearing. Could it have anything to do with the ozonator breaking it down somehow?