Calcium deposit on coping

18,000 Gallon, Saline Pool, No Heater installed.

Pool Chemistry was WNL with test strips and standard dilution tests. Also supplemented with a CYA melamine visual...

I have a underground pool, finished with marblite. Have black stains showing up at the bottom corners of pool. Anyone with suggestions on how to remove them, what is...

I have a salt water vinyl lined pool and have tannin stains on my fiberglass pool steps. What is the best way to get then clean and white again?

The 'check flow' warning appears. Screens check clean and backflush and rinse help. What does one do next? System was off for a few days while a different pool edge was...

PS water temp. is 84.9 and air temp is 81.

I had my water tested for copper and it was positive. I used sequa sol and then stain magic to treat the water. However, the stains themselves never disappears. What can...

when adding chlorine a black stains appear on the floor directly where chlorine is added - all chem levels within specs - PLEASE HELP

We had our pool resurfaced 16 months ago and hired a pool service to maintain weekly. We have not had any problems until recently. We have aqua blue staining on all of...

I treated my fiberglass inground twenty thousand gallon pool with one gallon of stain magnet and then sequa sol and the stains are still all over the bottom of my pool....

I notice that bubbles have formed in the fiberglass surface of the swimming pool. Could this be caused by the stain and scale removal product? It seemed to happen around...

I just tested the blue stains in my pool with Jacks stain kit. It definitely tested copper. The kit they have to remedy the copper says you have to bypass your heater...

Our pool liner is 2 years old and we have had problems with wrinkles since it was installed. (pool is only 3 years old) Last year the liner was fine. The pool company...

hi all,

Can anybody help . i have been cleaning a couple of pools for six months or more with no problems ( i live in spain.)

The problem is a couple of weeks ago all...

I just got my water tested after noticing yellowish brown stains on sides and bottom of pool. Iron is at 2.2. I bought a quart of liquid that is supposed to help reduce...

Why is there a black greasy-like crud collecting in the pool skimmer at the water line? It's easy to wipe out, but what is causing it and is there anything that can be...

my balance is good but my pool is still green i run my pump 24/7 i've been vaccuming everyday and brushing please help . itook my water sample to the pool store they are...

Help! I have a fibreglass inground pool that has a a white coating of what I assume to be calcium, caused by the hard water in this part of southern spain. I have...

Our white plastic parts in the pool, under the water are turning yellow.

The drain, the blower jets, the rim of the pool light and the skimmer basket outside cover that...

Any ideas for getting rid of yellow grout which builds up weekly, other than brushing it every week. pH & chlorine levels are fine and the water is crystal clear.