How will I know when I need to change the water?
My water has been in the tub for a little more than 3 months. The only difference I have noticed is that very small islands of larger bubbles collect in the corners when the air and water pumps are on. The borax induced froth is unchanged. The water is clear and has no odor.
The pH slowly drifts up to 7.8 in about a week and has to be adjusted down to 7.5. Chlorine is kept between 0.5 – 3 ppm with 12 ppm every two weeks. I add an appropriate amount of bleach twice a day. I wash out the filter with the kitchen sink hose when I superchlorinate. Total alkalinity is 45. Calcium hardness is 100.
350 gal Infinity using BBB