Recent content by drewh

So interesting someone else is having a similar issue... It sounds very similar. If you leave it for a few days and don't let the cleaner suck it up, what happens does it get larger? I got the pool testing kit, have kept levels perfect almost religiously, did a SLAM but all to no avail, the...

Re: Black (I think?) Algae that will not go away - any help appreciated! Hi, sorry for the double post. My FC is still maintaining about 6/6.5. Should I raise CYA to 80 as per the chart and then lower the SWG output slightly till its around 4 as per chart also? The algae/whatever it is is...

Just a quick question, my FC is maintaining at 6.5 now, CYA 45. This is slightly above the target FC for a non SWG pool (but I DO have one). Should I raise CYA to 60 as per chart & lower SWG output till its around 4? Or keep CYA lower till I can sort this issue out as it's much easier to add it...

Re: Black (I think?) Algae that will not go away - any help appreciated! zethacat - I'm useless when it comes to trees, but do wonder... it def should be gone. Jason, I haven't yet as I haven't actually been in for a while (weathers been all over the place here) and I needed to get a dropper...

Hi all, wish I was reporting better news but... whatever the black material/algae (if it is that) has returned in pretty much the same areas and new ones. It took a few days after stopping the SLAM but unfortunately it's back. My test results are: pH 7.5 FC 6 CC 0 CH 300 TA 140 CYA 45 (I...

Thanks chemgeek I didn't know this at all! Had read random info that higher TA stopped pH rising but that's all totally disregarded now! Will aim to lower TA to 80 as soon as I can, then aerate using jets to raise pH to 7.5.

Ok thanks chemgeek. Plugged in numbers into PoolMath and based on the higher CYA, and pH around 7.5 with CH and TA as is now it's about -0.17, but could get closer to zero if TA went up & pH would keep rising its not going to head more negative than -0.2 so thats good. Once I put in the borates...

Ok thanks chemgeek that makes perfect sense... hopefully won't need to cross that bridge but I do have spare trichlor picks here if need & easy enough to alter FC target. With the CSI, how negative could I go given my plaster situation? E.g. plugging in pH 7.5, TA 130 CH 300 (current results)...

Zethacat - thanks for the info. I think I'm done now, OCLT again 0.5ppm and it's looking clear. I've looked as close as I can into the pitted areas and it looks like the algae has gone (some are hard to tell because I can see the gunite/surface below it which has been a very similar colour to...

Chemgeek thank you for the super helpful reply - very interesting to read it all & learn. Here in Australia in the early 90s, at least in Queensland, many, many pools were Marblesheen (can think of about 10 in these few streets). I think you're spot on re the algae getting deep into the surface...

Re: Black (I think?) Algae that will not go away - any help appreciated! Hmm I wondered about that re corroding plaster.... Hope that isn't a really bad sign. Re cal hypo, forget I ever mentioned it? I haven't used cal hypo for 8-9+ years. I only asked in a diff thread just regarding a diff...

Re: Black (I think?) Algae that will not go away - any help appreciated! Thanks zetha will do, keeping at it! Re CH test, each time I've done it a second time immediately after and got the same result, on the same drop changing colour. So the results themselves are valid. But anyway just...

Re: Black (I think?) Algae that will not go away - any help appreciated! Ok test results are: FC 12 CC less than 0.5 pH 7.8 CH 300 (of all four tests done with TF100 every one has been different, last result 2 weeks ago was 225 - and each time I've done the test twice immediately afterwards to...

Yes true re cal hypo it was just a question asked for that other issue ages ago but I was way off! Not relevant to this SLAM now anyway. Haha... I learn that within a few msgs re pool store, and needless to say I haven't been there since started reading TFP and have no intentions to ever again...

Hey zetha, I hear you. The cal hypo bombing was just based off what my late father would do etc, he didn't really get into the details of what effects different chemicals had etc, would usually use cal hypo and broadcast it over the pool as that's what 'everyone' here at the time did, and so I...