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There is an area on the bottom of my fiberglass pool where the coating has come off. I see tan stuff underneath which I presume is the fiberglass. Is this just a cosmetic issue, or is the pool water going to damage the fiberglass?

Is there a way to decrease the water level in my pool * before opening it * using the pool pump (not an external pump?) The company opening my pool needs to do some work on the lights, but I don't want to pay them to stand around while they get the water level low enough. I am having trouble...

Hi everyone, When I opened my pool this past spring, it had a lot of earthworms in it, chlorine was 0, CYA was 0, and I had a positive ammonia test. It was not fun to get the pool in shape. I hardly had any earthworms in the pool over the summer, just one or two if it rained. The last few...

When we opened the pool this spring, we had ammonia. There were a lot of worms in the pool after a very rainy winter, and I guess their gut bacteria had eaten the stabilizer and made ammonia. Both CYA and FC were zero on opening; this had not happened the first season we opened. We had to use a...

Just opened my pool. Water didn't look horrible, but there was a bit of algae and a TON of earthworms (definitely didn't have that on last year's opening). Our winter here was all over the place, from below freezing to 4-70 or more degree days in Feb. CYA on opening was 0. I'm almost certain I...

Pool just opened today; readings are (Water mostly clear, not green, but a lot of dirt/debris with what looks like a small amount of algae on one seat. Pool was closed in Oct.) water temp 56F FC 1.5 CC 5.5 TA 70 Ca++ 150 CYA 0 (I let water sample for CYA test warm up on top of a running clothes...

Because of trees, we don't get direct sunlight on our pool until about 8:45 AM. Does the ambient light between sunrise and 8:45 have an effect on FC in an OCLT?

I know the three criteria for passing the OCLT, but have read many places on TFP that a sand filter can take up to a week to clear cloudy water. Doesn't that mean you may be SLAMing for a week when you don't need to? Hard to lose an extra week of swimming in a place where this is prime swimming...

Hi all, I have a Hayward T-9 SWG for a ~16K gal. pool. I know that SWG's only put out a small amt. of chlorine at a time. How do you other SWG owners handle a high bather load? Do you use bleach to get a quick FC spike before the pool party or right after, or do you just turn up your SWG? Also...

Can I work on balancing the FC, TA, etc. before getting the salt level to the proper level in my just-opened pool? I have a SWG but am leaving it off until I get the proper salt level (and using bleach to add chlorine) but I am raising the salt level slowly so I don't overshoot. The amount of...

I had an algae problem about a month ago and SLAMed successfully. The pool looks great now, but I can see some brownish stuff in my pool lights. Can I remove the lights while they're under water (after shutting off breaker, of course). Don't want to electrocute myself next year when I turn them...

My (new in June 2015) pool has been crystal clear all summer, but is now cloudy. I have ordered the TF-100 kit, but it's not here yet so I had my water tested at the pool store. Previous to finding this site, I would have my water tested there and add what they told me to. So far, have only had...

Talk about newb questions ;) The literature for my pool lists it as 18K gallons, but we were told by the builder that that measurement is when the pool is filled to the very top (which it never is). Do I use 18K gallons for the purposes of pool chemistry? If not, how do I know how many gallons...