I am experiencing some unusual staining in my plaster pool. There are a bunch of brown spots that seem to be moving around the pool. They do not feel any different from the rest of the pool and occasionally mostly fade away and then reappear a few feet away a few days later. I mainly only use 10% bleach and 20 baume MA. I tried to rub it out with a Puck to no luck so it doesn't seem to be algae.
My FC is generally 3-7, ph generally 7.4-7.8, cya is 35, calcium is 350-400, and alkalinity is 70-90, and their presence doesn't seem to correlate to any specific levels. I've only been maintaining this pool for 2 years and know the last owners used an ionizer and God knows what else but I didn't see it this at all last summer. I'm on city water.
My FC is generally 3-7, ph generally 7.4-7.8, cya is 35, calcium is 350-400, and alkalinity is 70-90, and their presence doesn't seem to correlate to any specific levels. I've only been maintaining this pool for 2 years and know the last owners used an ionizer and God knows what else but I didn't see it this at all last summer. I'm on city water.
