To SLAM or not to SLAM?

[myers2115]

I have been worried that i was losing too much FC during the days so I did an overnight test. Last night I had 4.5 & this morning 4.0 with .5 cc. Should I be concerned enough to SLAM?


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[jblizzle]

Borderline IMO. I prefer to do the OCLT starting up at least at 10ppm.

How does the water look? What is your CYA?

 

[myers2115]

CYA is 35. Water is clear. I'll try OCLT from 10 & see.


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[jblizzle]

Raise your CYA up to 50ppm and your FC loss will be less. The sun is starting to get intense.

I just bumped my CYA up from 40 to 80ppm for my SWG ... with no change to the SWG output, my FC is a good bit higher than it was. In fact, I meant to turn down the output over the weekend.

 

[myers2115]

Seriously? I thought 30-35 was ideal. I just drained it to get it down again. I'm in AZ Phoenix area


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[jblizzle]

I know you are in PHX, I am in Tucson.

TFP recommendations are 30-50ppm, depending on your level of sun exposure.

 

[myers2115]

Ok thx. I hadn't read anywhere that u lose less FC with higher cya. Since you're in Tucson, how much FC have u been losing in a day? How about in summer?


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[jblizzle]

Don't know, I run a SWG which is constantly adding FC.

It is fairly typical to have to add 2-4ppm of FC daily.
It is a little counter-intuitive, since when you raise the CYA level, you need to maintain a higher FC level, but in fact you lose less ppm daily.
You kind kind of think of the CYA as protecting a % of the FC. The higher the CYA, the higher % of FC protected. The danger with going too high though is that if a problem develops, extremely high FC are required.

 

[myers2115]

Need some advice after a major screwup. I have stenner auto chlorinator. My power went out & even though the pump says it has batter backup it failed to kick in. So I had to reset my time & timer. I set it to start at 10pm & accidentally set the end time for 1115am & didn't realize it until day 2. The stenner dumped 12 gallons of chlorine into my pool over that period of time. My chlorine ppm is 26. With a cya of 40, what do u recommend? Let it come down by itself? Should I be worried about anything? What's the safe level I can swim?


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[myers2115]

Meant to say the stenner dumped 12 gallons in without me realizing it.


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[brims]

FC will come down on it's own due to loss from the sun. 26 ppm is just above shock level for 60 ppm CYA, shouldn't hurt anything. Seems a little high to be swimming until it comes down to at least 16 for your CYA.

 

[Cinic]

The sun will burn it off quickly. If your pool gets full sun I bet you're under 20 FC by dusk tonight. Heck - 12 gallons for a pool your size should be upwards of 80 ppm FC. So you've likely already burned off the majority of it.

 

[myers2115]

It's already down to 11ppm. I'm assuming because it me 110 degrees outside & cya is 40 so any ppm above a certain amount will burn extra quick.


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