This is my first post on the site, but I do want to thank everyone for their input to the forums. You really have helped this first time pool owner greatly.
I bought this house last yr and the previous owner had a pool service that had the inline chlorine feeder maxed out year round. MY CYA was over 120 when I bought the house and Calcium was through the roof. I have since then got the chemistry inline and have been working on clearing pool surface stains since then. I use the chlorinator minmally and I chlorate with liquid chlorine (mostly) and powdered shock occasionally. My chemistry is below.
Current Temp 88
20K gallon pool with spa and spillover. I run the pump 8-10 hrs in the florida summer. I replaced the propane Hayward heater last year after the flame tubes rotted out.
The pool water is clear however I do battle with algae and high phosphates regularly. I feel like weekly I am brushing green algae off the bottom of the pool with a SS brush. If i brush hard enough I can get some of the brown streaks/scale to come off of the black pearl pebbletec finish. I have used Jacks Magic iron and cobalt remover per instructions with no success. I have tried the vitamin C tablet trick but did not notice much difference. Finally i dried sprinkling some dry acid on one of the pool steps and it seemed to take some of the brown away. I left it on there for only 5 minutes before brushing it off.
My question: Is this calcium scale or some kind of hard algae that is causing these streaks in my pool? Is an acid wash or Jacks magic Copper and Scale stuff recommended? Any other recommendations?
Attached are some pictures of my situation. 2.jpg1.jpg3.jpg6.jpg7.jpg