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I recently installed a Hayward SWG. It recommends CYA level of 30-50. I see that the Pool School recommends a much higher CYA of 70-80. I have used a five gallon drum of acid in 6 weeks which is almost a pint a day. I have now gone with TFP advice and .. Upped the CYA. Got TA in recommended...

Thanks for all your inputs. I will use the results from gentle shaking!

The Taylor 100 kit was bought in January through Amazon. PH reagent expiry 07/17 so that should not be an issue. Shaking vigorously or inverting two or three times: should that make a difference to the chemical reaction? It seems that when FC is low at the end of the (sunny) day that this...

FC 5.5 CC 0.0 PH 7.2 after vigorous shaking 8.2 before?? TA 40 CH 625 CYA No reading (0.0) maybe the chemical has gone off? So am thinking it is low TA that may be causing this. Will sort that out and test again.

FC 5.5 CC zero

I have been using TFP for a couple of years now and have not had a green pool for a long time :). All I do is use a Taylor 100 kit and test for chlorine and PH every morning and add bleach acid as needed. Very occasionally I do a full test but all it tells me is what I already know! However...

Well I think I know the pros and cons now. I will try this Poolsan product for a little longer. The system should ensure that when I come back from my two weeks holiday I come back to a clear pool. I will certainly add chlorine if I have kids party but generally it is only me and my 10 yr old...

Ok so an update. After 6 weeks the pool finally started turning green and I noticed some black spots on the bottom of the pool where debris had been. Called pool guy and he came armed with more details of the Poolsan" (see Poolsanuk.com) compound. It states it is an aqueous ionic compound of...

I have been using the TFPC method for nearly a year and can vouch that it works! However it is a daily time consuming operation and expensive in Chlorine where I live in Barbados (US$6 gall.). Also when I am away for a couple of weeks the pool invariably goes green despite leaving explicit...

So I slammed pool and caught it early so should be ok. The FC had never gone below 3 and CC was 0. So bit stumped as to why it started to go green. It is true that the algae I first saw was at the bottom of the wall on the side of the pool below the jets (there are three along that side of the...

No. Straightforward pool as per photo. And went green yesterday so I spoke too soon!

OK thanks. My PH shot up from 7.6 two days ago to 8.2 this morning and the PH seems to be continually rising and I am going through a fair amount of MAcid. Any thoughts on why?

Three weeks of a crystal clear pool since the last SLAM.:D I would add a pic but upload fails each time...maybe file is too big? Today 7 am FC 3.5 added 30oz 5.25% PH 7.6 CC <.5 TA 70 CH 420 this was 350 a month ago??? CYA 35-40 On average I put in about 40oz of 5.25% bleach per day...

What effect does each 3" tablet have on CYA level and FC level in a 11,500 concrete pool? I cannot work it out from Pool Math. I wanted to put in a couple of tablets while I am away for the weekend. My CYA level is 40 so I think I can do this without a problem. Just not sure and effect on FC as...

What I meant was two more days after passing OCLT.

Re #67 this was a while after slamming and FC had gone down to 1-2 for a short time (8hrs max). Re #74 it was beginning to go green. After my previous slam the OCLT results were fine. Three mornings passed with no FC loss at night, CC <0.5, and crystal clear water. I think I let FC drift down...

My pool is now green again despite following procedures as closely as possible. I am going to SLAM again and keep it SLAMMED for a few days after it passes OTLC. Really fed up with the time I am spending on this pool. - - - Updated - - - This am: FC 4 CC 0 PH 7.8 Will do all tests before slamming.

- - - Updated - - -

I will try to take some tomorrow.

Concrete (starbright or something like that, not painted). Normally add liquid bleach in morning if FC is (say) at 3.5 like this morning to make sure enough FC during the day. The latest green came when FC went from 7.5 at dusk to 5 the following morning. Prior to this the FC had been same in...

I think just floor. I scrub walls but now you mention it I don't see the same green that I see when I scrub the bottom. Is that significant? The are a lot of palms around but I don't think pollen. I think black algae on the palms and on pool deck / coping stones etc due to whitefly or mealy...

"Is the water crystal clear with no sign of algae? If not, then you are not done with the SLAM process (which is usually much longer than 2-3 days). What FC level were you maintaining for the SLAM? Where are you seeing the algae showing up?" FC level was 16 per pool math CYA 40. Algae all...

Pool had light algae again this morning. FC 5 (7.5 last night) PH 7.6 (7.4) I SLAMMED the pool Tuesday and Wednesday and it passed the OCLT test on Wed/Thurs and Friday mornings. Why does algae keep returning? I scrubbed the pool early and checked FC at 1:30 pm = 4.5 Pool looks good, no...

I am looking for a new pump as my Hayward 1HP is rattling . Interested in variable speed. My fuel costs are 32cents a kw. What are the advantages of variable speed and are they more expensive?

glad to know I am not the only one who doesn't like the OTO test. I also often have problems determining the PH although this morning it was very clear. FC 10 so no loss overnight. PH 7.4 and pool crystal clear :)

I think I let the FC level get down to 1 for a day or so and the algae started a couple of days later even though I had put FC up to 4-5. Have to be more careful. However I find it difficult to read the Taylor Total Chlorine yellow color test and even harder with the PH test. I do the FC test...

This evening FC 10 PH 7.4 (put muriatic acid in this morning) - - - Updated - - - so I put muriatic acid in a bit too early. I'll remember next time.

Slamming. Passed OCLT test this morning. FC 15 CC 0.0 PH 8.2 (+?) CYA 40 TA 70