Perimeter Stain

[mbar]

Thanks Waterbear! Last year I played around a lot with the water in my pool to see what would stain, and what wouldn't - I ran high ph with low chlorine, ran high ph with high chlorine, ran low ph with high chlorine, and low ph with low chlorine. I started the year with low cya, so I was able to do these tests along during the time I was raising my cya with trichlor pucks. I used very little sequestering agent, to see what happened after ascorbic acid treatments, verses using just the sequestering agent with low ph to take the stain away. Now this year I am trying to do the whole summer without stains. So far, I have been able to open it and be almost stain free - I noticed a little stain forming on my seats, so I brought the ph down and added more sequestering agent - the stains lightened up. I put 3 bottles of Sequasol in so far. My pool is perfectly clear, and stain free (yeah) This year my cya didn't disappear, so I started with a cya of 35 - I am using almost all bleach - I do put a puck in the skimmer whenever I add water, and whenever I take my chlorine high. So far so good, but I am not counting my chickens, because in past experiments those nasty little brown stains came back to taunt me! I have some other theory's too - but nothing I can say for sure. I will keep trying and hopefully we can all learn from each other - that's why it is so great when others post their results here. Thanks again Evan, you really explain the chemistry in a way I can understand it.

[waterbear]

Marie,
Very glad to hear it was helpful!