'Biopools' are not germ free because 1) they contain nothing in the water to kill bacteria or inactivate viruses or protozoan cysts and 2) every time...

Yeah. A little 5.5k gallon pool won't take long at all to acid wash.

You might consider calling in a pro to do it. Being a quickie should keep the...

Iron??

So solved or what??

Lower the ph and try brushing again.

What are your other numbers?
TA
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OK. So it's a mineral (metal) stain.

If the cause is copper, the water can be tested easily and cheaply.

If not copper, then it may be iron or...

Somebody offered a good solution to scale on pool coping here.

There may have been some free copper in the water, but with a FCl level of 4-5, the copper may have oxidized and caused the discoloration.

Could you describe the stains a little.

Often stains are a result of metals or tannins in the water, but other times algae can give the impression...

drain the pool to below the steps and acid wash them lightly in the spring.

Getting clear water through the heater really doesn't tell you if there is copper coming through. He is right that over time if you have a copper...

Hi There, My whole pool was aqua blue and I was told it was copper staining from the heater. The only thing that worked for us to get the staining...

I to have exactly the same problem with my pools here in Spain. It is not the type of sun cream, it is the amount and the high factor creams, which...