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Thank you, @Leebo, for all your work to keep the forum running and improving. I predict an invasion of alien, super chlorine-resistant mustard algae hitting the planet at the exact moment you click the "update" button. Chaos, panic and disorder will be the logical consequence when victims won't...

Don't know, SWCG is just bit of a mouthful. Every respectable job needs a three letter acronym. And producing chlorine is clearly the most important of all jobs around a pool.

Now you're diving very deep into string theory. Very controversial stuff.

But... but... at least 50cm of that string are now made from glass fibre.

I'm not 100% convinced yet. Does anyone have titration test for that? Not sure if that meter has been calibrated properly.

I agree that it's not a super urgent issue, I'm sure there are many issues that are more important. Just some odd behaviour that seems to confuse people from time to time.

Old thread, I know. This behaviour occurs not just in the extended test kit directions. It keeps getting me. Other examples: https://www.troublefreepool.com/blog/category/pool-school/pool-care-basics/ https://www.troublefreepool.com/blog/category/pool-school/algae/...

You were faster with the metal examples. Got distracted while typing by "my" duck having to fight off another duck couple trying to claim her nesting spot. Pretty impressive to see an angry mummy duck.

I quite like that idea. There are a lot of things that folks might like to track in their personal circumstances. Some with recurring staining problems might want to track metal test results or sequestrant additions for example. Or an AA treatment. Customised test results / chemical additions...

I get that in chrome on my android phone sometimes. But not just on TFP.

Gotta love your green poo... (While I was typing, autocorrect vetoed the green substance, and added an "l")

Let's be honest, without all of these autocorrect interventions, many threads would be half as much fun to read. Just a recent example: "mutating acid" Autocorrect is great...

It's not easy to find on a mobile device. This workaround works for me to get there on my phone: - Do a dummy search (can even be an empty search). That leads you to the page "google search results". - Then you hit "< search" - Then "SEARCH EVERYTHING" More straight forward to get to on a...

There actually is now a "newer than" and an "older than" feature in the advanced search: https://www.troublefreepool.com/search/

What's of most interested is the target range it shows on the overview page, like 3 to 10 for a CYA of 70 with a SWG. The 3 is the min FC (with SWG) - you never ever want to get below that, always have a buffer to that number. The 10 is the top end of the non-SWG-target. You want to be somewhere...

The formula to calculate CSI looks in a simplified form like this: CSI = pH + f(CH) + f(CA) + f(T) - f(TDS) where "f(...)" means "function of ...". We don't really need to know how these "functions" actually look like, we can just let PoolMath do the work, but it helps to at least understand...

Yep, the 'log page' is always more accurate, e.g. regarding influence of TA on required MA amounts to adjust pH. On the other hand, 'effects of adding' sometimes gives information on 'side effects' that you don't get from the 'log page', like effect on TA when adding MA, or effect on pH when...

The 233oz look right to me. PoolMath internally assumes that a "Bleach-Percentage" above 10% must be from "pool liquid chlorine" where the percentage shown on the bottle usually is "Trade-%", whereas values below 10% must be from "household bleach" where the percentage shown on the bottle...

I wouldn't really call it a problem - looks like no one had even noticed it until aussieta. It really only occurs when calculating the volume in one unit system and then changing to another unit system - not really an everyday scenario. I guess most people just use it these days for a quick...

Do you mean at the bottom, under "Estimating pool volume"? Just tried it, you are right. When entering width, length and depth in m, and then changing to US: The units just change from m to ft without adjusting the values. E.g., a 75000 l pool becomes 560 gal instead of 19813 gal. I'm with...

Looks like you are on the right track, just keep slamming. Have a look at this thread regarding breakdown of bleach: https://www.troublefreepool.com/threads/breakdown-of-bleach-over-time-by-storage-temperature.60837/ But as you said, doesn't matter too much as long as you get your FC to where...

But 2180mL would raise FC only by 0.15 X 2.180L / 34600L = 9.45ppm That also doesn't make sense.

But apart from that app inconsistency, that I'm sure Leebo will sort out: I guess there are two reasons for your "missing" chlorine: 1) You are SLAMming for good reason, added Chlorine can get consumed very quickly when in the middle of an algae bloom. What's the exact reason why you are...

And I just confirmed it with a hand calculation. The 3341ml are definitely correct to raise FC by 14.5 ppm with 15% bleach: 0.15 X 3.341l / 34600l = 14.48ppm The 12ppm rise from the effects calculation would be correct for 12.5% bleach: 0.125 X 3.342l / 34600l = 12.07ppm For some reason...

Hey Jesper, Sorry, that was phrased badly. When I wrote that I got the same, then I meant that I got the same results as you. I'm with you here, something is not consistent.

I also checked it, and got the same numbers as in the OP. Just did it again, checked the pool volume, and still got the same.

It looks like in the "Effects of Adding" PoolMath calculates with 12.5% instead of 15% bleach strength. That might be an intentional feature because 15% bleach loses its strength very quickly and 12.5% might be a more realistic chlorine content by the time you actually use the bleach. The...