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Hey guys, I've been getting these black marks on my pool and if I rub a vitamin C tablet on them they go away - I told this to an expert and they still told me it's just osmosis and there's basically nothing I can do about it. This made me sad as I've only had it resurfaced a few years ago. If...

Hi all, I had my fibreglass pool resurfaced nearly 1 year ago. Im now noticing some small black marks on the walls. Any advice on what it might be and how to fix? Thanks!

Hello wonderful people, ive just had my fibreglass pool resurfaced and I need help on filling/balancing. Ive tested the tap water and got - FC - 0 PH - 7.4 CYA - 0 Salt - 0 TA - 50 Should I add the salt (8 bags) and leave SWCG off til its dissolved and add liquid chlorine? Assume Ill need...

After successfully fixing my own algae problem thanks to this site and buying my own testing kit, I want to fix my parents pool. I was over there today and noticed they have black algae. I scrapped a bit off and it was green. I've read the article on here about black algae, is it correct that...

With a SWG, CH should be kept between 350 to 450. Calcium helps fiberglass pools resist staining and cobalt spotting....Is this correct as I read somewhere else on here fibreglass SWG 220-300....current SWG fibreglass pool is CH 225....and some staining so was hoping this may be the cause? Cheers

Is it true when adding acid only do 500ml max at one time? How long between additions? Got a high TA and want to reduce asap. Cheers

I'll start by saying I'm a new pool owner and I've quickly learnt that it's not easy! I'm in Australia, I have a 30,000L fibreglass salt pool with a sand filter. I've had a mustard algae problem for months now and I've been following advice from pool shop...these guys are a bit old school, don't...