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Operators are required to test manually alongside ORP here as well. If measuring ORP alone you could end up with some pretty wacky FC and pH levels. I think the ORP requirement is good to have for public pools though (even if it does have its weaknesses) because without it, I think it would be...

The contradiction in those two graphs does make an interesting point. It seems correct to say that ORP sensors become useless at high CYA levels. Perhaps that's the rationale behind the 50 ppm max allowed CYA in the province where I used to work. The max really wouldn't be necessary for other...

My panel allows for 1% increments above 5. I'm definitely not going through anywhere close to 1 ppm a day. I can leave the generator off for a day right now and not see a measurable drop in FC. My hot tub other hand goes through at least 1 ppm a day...

I just have a solar cover as well but I find it reduces the chlorine loss a lot when it's on. My pool is pretty small (just 8400 gallons). It is also fiberglass, which may account for a lower chlorine demand.

No, not a typo. Is your pool covered? Mine is covered when not in use. I have low sun exposure with pine trees and my yard backing onto a hill. In the summer I will increase it to 15 or 20% with a longer run time but that's where I'm at now.

To say that sanitation is sufficient if algae is not present is a bit of an oversimplification. I don't know what the CT value is for algae (since it's not a microbe of public health importance I'm not aware of it being studied) but the CT value for Giardia for example is 62. If you are running...

That video is horrifying!

This paper illustrates the point I was trying to make which is that the higher your CYA to FC ratio goes, the higher the risk of infection gets. I agree that the TFP levels are an improvement over health regs in most (but not all) jurisdictions. If they would adopt TFP levels in my current...

I will admit, I'm a bit of a germaphobe!

I understand that comparing UV to the SWG is apples to oranges - I was just using it to illustrate the point I was making which is that it is the high chlorine level at the cell itself that allows a SWG pool to 'get away' with a lower FC to CYA ratio. The high level of chlorine in the spot that...

Turnover is actually applicable to the concept of being able to run a lower FC to CYA ratio in a saltwater pool versus a regular chlorine pool. While TFP might not get into the explanation behind it, that is how it functions. The only reason this lower ratio is achievable is because of the high...

I really don't see a need to have a higher CYA level in a salt water pool versus non salt water pool IF you can easily maintain your FC level. I run my pump for 4 hours a day with my SWG set to 6% and my chlorine level is never below recommended. But like I said, with full sun exposure someone...

posts split from Pool Math vs National Swimming Pool Foundation Range Variance The only reason you would want to raise your CYA is if you're having trouble maintaining adequate chlorine levels due to UV loss. Otherwise, more is not better. CYA makes chlorine much less powerful and increases the...

I'm sure you are right about warranty claims being impossible!

You would think it would happen with a low pH, but actually they say it happens when the pH is over 7.4. They recommend a tight range of 7.2 to 7.4 to combat the chalking gel coat issue. I didn't have a low pH when I observed this - in fact I was fighting a high pH constantly (which I have...

I'd be interested to know exactly how it impacts the gel coat. Leisure Pools sent out this handbook a few months after I discovered the issue in my pool

Alkalinity also seems to play a role in protecting the gel coat on some fiberglass pools. I tried to go with a low alkalinity so I could stop fighting the pH rise and ended up with a white haze on my fiberglass pool. This immediately dissapeared when I brought the alkalinity up to the minimum...

Maybe it is dust that comes off the cover when you remove it. Also, skimming doesn't really work while a cover is on so the haze could be from that.

Interestingly, eczema can actually be improved by bleach baths so it may not be problematic. I am very sensitive to poorly maintained pools (likely the combined chlroines). I use a layer of grape seed oil on my skin as a barrier if I have to go in a public pool and it works wonders for me

Well, after failing at keeping my pH low enough with low alkalinity I decided to boost my alkalinity, hardness and CYA. My current chemistry is: FAC 2.3 ppm TAC 2.3 ppm PH 7.9 Hardness 365 CYA 30 ppm Salt 3200 Alkalinity 90 ppm My adjustments were made yesterday. This morning my pH was 7.5 and...

Even in the absence of acid injection?

CYA is 25 ppm. I know some recommend higher but I'm not a fan of going over 30 ppm

It is the right amount provided I've got the cover off and it is sunny as it is currently 2 ppm FAC. I'm adding acid daily though ...

I'm wondering if the SWG is just pumping out more chlorine than this small pool needs causing my pH to keep going up. I am burning off the chlorine right now because I've got the solar cover off but there's still a large amount that would be getting generated

Correction- it is 10 000 gallons not litres

I've got a 10000 litre fiberglass pool with a SWG and hayward cartridge filter. My FAC is currently 2 ppm, CC 0.1 ppm, CH 200 ppm, TA 20 ppm. I have a solar cover but I've been leaving it off lately as my temp was getting too high (90 degrees). When I had it on the FAC was climbing higher than...

I did take a sample to the pool store to double check on the TA and CH as I my kit is about 3 years old now so I wanted to get a reference. Since my TA was only 20 ppm and I've not added any sodium bicarb (I got tired of fighting with it causing my pH to rise even more) i cant imagine there...

I dont have another test kit to compare to, but I suspect my colorq is accurate because it does show consistent readings on my hot tub and it reflects the changes I make when I add acid. I brought my pH down from 7.9 to 7.5 last night and by morning it was back up to 7.7

I have a lamotte colour q pro

My alkalinity is very low (20 ppm) and I havent been adding sodium bicarb. I have a SWG and my chlorine is sometimes higher than needed on the lowest setting (likely because my pool is quite small) so that is constantly raising my pH.