SLAM - the math AND the reality

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3 ppm lost during the day with a lot of direct Sun sounds about right. It's a little high, but certainly not unheard of. The key is how much is lost after dark.

If it comforts you any, I'm having to SLAM right now because I keep getting mustard algae. The doctor won't let me get me head wet and my wife has a cast so she can't go in either. We have no way to clean out the light niches :-x
 
I do not take comfort in your misery ! Lol.

I see a very slight yellow shading on sides of my pool and the top step ( fixed plaster steps not metal ) Is this likely just fading from sun as pool is 25 years old ?
I passed OTLC last night, but will do it again tonight.

The thing that drives me most nuts is the CYA testing as CYA is so important to everything get the test method is so subjective and not accurate at all. Which is kind of annoying considering how precise everything else is.

I find the light glare in that narrow tube , which has a wierd shape and causes a big reflection of the light, even in shade and blocks the black dot. Not to mention how subjective the disappearing black dot is - I get between 55 and 75

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7/25/15
7.00 am
FC 14 on both tests

Last night I got 13.5 and 14

So, zero loss overnight. SLAM passed.

Thx to everyone for the advice, and also some of the awesome information that can be found in this thread for others.



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Congrats on passing :)

That CYA test can be hard.. Try doing it at 5pm, outside, sunny, sun behind your back, pour it in the tube and read, pour it back and do again 3 or 4 more times.. from then on do it the same exact way, place, sun :)
 
simonoaks said:
I find the light glare in that narrow tube , which has a wierd shape and causes a big reflection of the light, even in shade and blocks the black dot. Not to mention how subjective the disappearing black dot is - I get between 55 and 75
Click to expand...

The reflection of the sky in the tube is what drives me the most crazy about that test. That's why now I do it under a tree ... so there's no reflection.

When you think about it, a disappearing black dot is not subjective at all: it's either visible or it isn't. The problem is when we're not sure if we *really* see it faintly, or if we're tricking ourselves. Repeating the test a couple of times by pouring back and forth eliminates some of that error. I also find that wiggling the bottom of the tube confirms whether I can really see the dot or not.
 
Right. It is a wierd test. It is finding the point where it JUST dissappears that is hard. When I think it is gone, I can look away and then see it again. Strange how there is not a chemical - drop by drop count test for it.

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I did this a few times and got 55-65 , I just added 70oz of liquid staberlizer to bring it up to 75. Which also means we swam in it at above shock level during SLAM. Still not sure why there can't be an accurate way of measuring CYA via some sort of reagent method.

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Right. I finished and passed my SLAM, I am now rebalancing everything. I did my SLAM thinking I was at CYA 70, when in fact I was probably closer to 55. So we were swimming during SLAM at too high FC ( I kept it at 28 ish)

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Think I will just not worry about it and just keep pool ticking over at my preferred FC of 8-9. Only need to check CYA if I have to run SWG too much to meet target, or if I ever need to SLAM again. It is above 55, that will do .

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I wish the "50 ppm CYA control solution" were included in the Taylor kits (and I guess, by extension, in the TFtest kits).
It would make it so much easier to know if you are doing the test properly, for your eyes. It's available at TFTESTKITS.NET ... I guess maybe we should all start suggesting people buy a bottle of that the same way we recommend a speed-stir. :rolleyes:
 
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