Hi guys , having a bit of a nightmare with black spot algae in a salt pool that's not mine but trying to clear it up before I leave , when I got here it looked like a carpet of algae on the walls but dose of calcium hypochlorite followed by 3 days with a dive mask and a hand scrubbing brush and lots of hoovering to waste it looked pretty good . Looking at the readings now with a basic tester ( we are in New Zealand in the middle of nowhere ) I'm getting a ph reading of 8.2 which I can bring down with Mauriac acid but it creeps back up in a couple of days the total alkalinity is 120 . The cl is reding 1.0 with the palintest pool tester
That's all the readings I can do .
Then the spots have started coming back , they are prob 1 or 2 mm across and really quite stubborn a normal pool brush doesn't get them off , and there is also a white substance that seems to be tougher than the black spots it's almost like sand but does scrub off with the hand brush
So In summary , I could prob get another load of hypo but it's 3 hours drive and the shop that sells it doesn't seem to know anything I had no idea how thick the algae was when I first put the dose in , so I think its effectiveness could have been restricted !
And the pH comes up really fast I've read that salt pools do this anyway but 2 days seems very fast (I've never really come across salt pools )
There is also possibly a problem with the control box it runs fine on filtration , but if you turn the 6 pos to waste or backwash it comes up with low flow , but the waste is pumping loads of water out so I really don't think it is that
It's a zodiac control panel, a fibreglass pool ( one piece thing ) and a serious headache !!
Any help would be amazing !!