I drained the pool last weekend due to high CYA levels. I tried to power-wash what I thought was algae today with no results. I tried brushing an area with 6% bleach and...

I have crystal clear water and horrid looking black/gray stains in various areas of my pool' horizontal surfaces. Not sure what to do next. Pool chems are all good to...

Hi Everybody,

I have an in-ground spa that is approx 1600 gallons. It is a salt system and has 3M colored plaster (tan color). I drained the water yesterday and...

I am not sure which Topic heading this should be posted under as I am not really sure what is happening. I have had my above ground pool (installed half way in the...

Great info on pool stains, I have been reading several pages. My Problem is i just had an algae attack last week in my inground gunite pool with a gray painted surface...

Hi,

I live in Edmonton, Alberta. I was winterizing my vinyl lined pool the other day. I shocked the pool and the next day came out and checked on it. At the deep end...

On 10-30:
My pool is indoors and was cloudy/white 2 days ago w/low FC for 1 day. It's been beautiful for the last 3 months. I shocked w/recommended 12 to 16ppm FC w/6%...

I have a customer with a white marble dust pool with goose crap stains all over the bottom. The stains have been there for 2 years. The marble dust is only 3 years old I...

Back in July, I had a HUGE green algae problem. I super-chlorinated and added a double dose of Copper Based algaecide (Strike Out) twice. After the water cleared up and...

I was wondering what would actually cause the stain when a goose dropping sits on marble dust. I assume this is a biological stain but was wondering if maybe there was...

why not acid wash vinyl liner, i have seen many people say not to , but dont see any that says why not , what will it do, i have had great luck with mine

Too low of ph cased acid condition in my pool and caused copper heat exchanger in heater to turn liner light black discoloration. will this stain go away on its own?

Help....I have had three pools before and this is my first one with a salt system. Iam always adding acid and when Ive asked advice from my local pool store their...

I opened and shocked my pool just a few days ago, as usual. Suddenly, a sand like substance appeared on the bottom and side walls of my pool. It cannot be brushed away....

Hi all,

So for the most part my knowledge of chemistry and my major in it helps me with maintaining a pool, though I cannot say I know all the intricacies of pool...

Hi,
We have a hotel pool which the last few days has developed a 10cm yellowish color above water level on the liner walls. I'm almost sure that comes from sun oil...

1 year old gunite pool. Northern California city of Willows water. Scattered, (some large) brownish stains. Contacted pool builder numerous times, (each time I get a...

This summer (my second as a pool owner) I got lazy on my testing. I use a Taylor test kit. Anyway, the pool was looking great. I had beautiful sparkling water and I took...

I've been trying to brush this away for weeks and the stains don't move. I showed these pictures to the guy at Leslies, he told me to squeeze a lemon on it to see if it...