Why is Ph climbing?

[waterbear]

If you are using dichlor you want to maintain a FC reading of about 4-6 ppm before use. after using the spa shock it with bleach (about 1/2 cup of ultra bleach is about right). this should raise the FC to about 10 ppm and get rid of any CC. the higher heat, smaller water volume, and higher bather load requires a higher FC than a pool. Some CYA is necessary in an outdoor spa exposed to the sun but if you check your FC before using it and add the dichlor if needed and shock with bleach or dichlor after use you should be fine. Since the spa is drained and refilled every 1-3 months buildup of high CYA levels in the water from the Dichlor is not usually a problem, The biggest problem is usually pH and TA control because of the constant aeration from the bubblers and jets.

[csevel]

Thank you...that clears it up nicely for me..