Keeping the Chlorine up and light yellow stains

[tagprod]

One thing I don't see mentioned here is the higher CYA requirements listed in the manuals for SWGs. I have an aqualogic and the owner's manual lists ideal CYA levels between 60-80 PPM. According to the pentair web site they recommend CYA between 50-75 PPM. I've noticed much better chlorine production when my CYA levels are in this range.

Look at page 11 of the owner's manual for you SWG

http://www.pentairpool.com/misc/owne...lor_Owners.pdf

[mbar]

How long ago did you do the stain treatment? Using ascorbic acid can make it hard to keep a chlorine level for a while, because the chlorine is used up getting rid if the ascorbic acid. It will also lower your ph and alkalilnity. You have to keep your chorine very steady after a stain treatment so that you do not have to shock. You should not shock for at least 2 weeks after an ascorbic acid treatment. You also have to add borax to get your ph back into range, but for now I would leave the ph low and add more sequestereing agent. It may be enough to lighten the stains. Sequestering agents sometimes lower ph also. If not just pour a little ascorbic acid where you see the staining. When the stain is gone, start to balance the water and keep adding chlorine (I use bleach so that I can control the amount) until you get to 5 - 6ppms. Try not to let it get lower, and don't get it up to shock which at a cya of 30 - 50 would be 15ppms. Let me know if you have any other questions