I am still having problems with staining. This is what I have been doing to correct the problem.

I lowered my ph to 7.2, allowed the chlorine to drop to .5, and then poured in the specified dose of metal out. The stains dissappeared almost immediately. For two days I ran the filter and backwashed each day. Then I allowed the chlorine level from the salt generator to rise to 1.5. and the ph to 7.4. Within hours, the stains came back. I lowered the ph and chlorine again, and the stains disappeared again. I am now running the pool and backwashing again. How long will this process take before the stains stay away? My pool numbers are good, except for the alkalinity which is 135. I am trying to get that down through lowering the ph and aeration.
Thanks for helping me.
Dorie