Every night I've been adding dichlor up to 5 ppm fc and in the morning its back down to .5 - 1 ppm. This is ever since I refilled it after neglecting the spa for about 2 months. Also at some point in that 2 month period the circ pump died.. So new pump, drained the water, refilled. Now something's using up all the chlorine.
The waters perfectly clear, no smell/cloudyness/scaling anything like that. I did check the filters which I cleaned 3 days ago during the refill, and they had yellowish brown stains all over, not sure if that is bacteria growth or from all the chlorine I've been adding?
Also I was recommended to test the phosphate level and its high at 500 ppm (fill water is 500ppm).
Other info I do have an ozonator, its 500 gallons, 4 years old
So any ideas?