My latest noob question:
Is it common to have blotchiness on the finish?
It's a white plaster pool, supposedly redone less than 2 years ago. I have no idea what's been done to it, and I don't have much confidence in the pool service that's been maintaining it for the last 15 years since my CYA is off the scale.
There are patches on the bottom that just plain look dirty. Brushing hard doesn't seem to change things, yet when I brush, the dirt I do raise appears to be the same color. On the steps of the spa section, it's sort of mottled. There's this sort of grayish film, with "bubbles" of whiteness. It's not slippery at all, and the finish is smooth, no scale. I tried brushing really hard in case it was just film, no lifting.
I searched the forum and tried rubbing a chlorine puck on it. All it did was leave chlorine puck on the step, which was easily rubbed away with my finger. One of the threads also mentioned setting a puck on the stain a while. How long is a while? 5, 30, 60 minutes? A week?
I'm wondering if it isn't just the nature of concrete? The patio and the garage floor aren't uniform, either....
The water is sparkling clean. We've used the spa end a couple times and had no skin irritation, red eyes, or ear infections.
pH is settled nicely at 7.4, Alkalinity was 130 this morning, Chlorine reads off the scale. I can't do anything about the CYA or Calcium right now, still under water conservation rules.