Hi ericorlisa. Glad things have been going well for you.
I have not heard of muriatic acid causing brown stuff to accumulate on the pool floor. I would suggest however, smaller doses of acid at a time when you need to lower pH. What is the pH now?
You definitely need to buy a new gauge, Pool stores carry them of course and maybe Home Depot of Lowe's? Not sure about that.
Regarding when to start a new thread, there is no hard and fast rule, but usually just whenever the problem or question is something different. Actually, I think I will move this post into a new thread and retitle it as "Dose of Muriatic Acid Caused Brown Debris on pool floor?" It will be in the "Pool Water Problems" section of the forum. Look for it there. So, we'll let the discussion be continued there for anybody that would like to reply.
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