FCL - Not Enough

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proavia said:
The reagents should be dispensed only with the bottle held completely vertical. If you apply pressure to the bottle at all, use only enough pressure to allow each drop to fully form on the tip prior to it dropping of its own accord - do not force the drops off the tip. Dispense the drops at about 1 drop per second maximum.

Practice and consistency will result in more accurrate test results. Using a Speedstir will increase accuracy.
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Thank you. I just took a few minutes to do 44 drops and repeated my test from above. I am using a SpeedStir.
 
Once you figure out a system, you will continue to get repeatable results. It took us all a while to figure it out.
 
Drop size matters in all the tests where you count the drop. By counting drops you are measuring the amount of reagent used. The tip of the bottle is shaped to form a uniform size drop when allowed to slowly form and drop off. Squeezing the bottle to pop the drops off will create smaller drops, you will use more drops to get the result, and you will test high.
 
Cal hypo is fine if your CH is low. Your Poolmath logs show your CH results all over the place. What is your CH?
 
At 275 you can use cal hypo. Your season is nearly over and you will drain a significant amount of water prior to closing. If you find liquid chlorine, use it. Keep testing your CH every couple weeks to know what it is at closing.
 

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mknauss said:
At 275 you can use cal hypo. Your season is nearly over and you will drain a significant amount of water prior to closing. If you find liquid chlorine, use it. Keep testing your CH every couple weeks to know what it is at closing.
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mknauss, what’s your opinion on the OCLT at SLAM level or something lower like 10. I feel like my testing is all over the place. Not sure what to think.
 
At very elevated FC levels, the OCLT can be an issue. If the pool meets the other two criteria, no dead algae, etc, then let the FC drift down into the teens to do the OCLT.
 
6:00 AM
TF-100
FC 26.5
CC 0.0
0.5 Loss overnight

ColorQ 7 (Diluted with distilled water)
FC 24.42
CC 0.00
0.84 loss overnight

You guys ok with that? If so, I’ll let the FCL drift down and test again tonight at a lower value. And probably keep doing so until it gets to a little under 10.
 
Getting a little ahead of myself and back to my original question.

Messing around with pool math app, for a 22k pool, running my salt cell at 100%, should add 0.33333 FC ppm per hour. Or a total of 8 ppm per day. If I ran at 50%, it would add 4 ppm per day. 25%, 2 ppm per day.

I haven’t searched the forum yet, so I apologize, but on a sunny day with lots of bathers (kids and their friends), CYA of 70, what’s the typical chlorine burn off? There are many factors surely, but I’m just curious if anyone has some numbers on that. Overnight of 9.25 hours, I was losing 0.05 to 0.08 ppm per hour (depending on which test was used). Meaning I would lose 1.2 - 1.92 ppm per day. Thus, I have to run at 25% just to keep up with an OCLT per hour rate. Let alone sun and kids.

For future, I’m going to ensure to stay well above the minimum and prob above the target. Better to have a bit more as a buffer than to have to SLAM again. I think my issue was that I would fire up pool math app, add in my target of 5, add in my current of 3, add 24 hour pump run time and it would tell me to run SWG at 25%. That’s fine, but that assumes zero FCL loss due to factors.

I’m wondering if there should be a spot in the pool math app to add in a typical PPM loss per hour which would factor into the SWG run time / % setting, so users understand the full impact. I never thought about all of that until going through this. I know that’s variable based on many factors, but at the very least a typical OCLT loss rate could be added.

Meaning, it wouldn’t only calculate how long you need to run to get from current to target, but also what you would need to set at to overcome losses as well. It wouldn’t be perfect, but it would protect a noob like myself from going too low.
 
Target FC in the FC/CYA Levels takes into account the expected daily FC loss. The difference between the target of 5 and the minimum of 3 is the possible daily loss. If you run your SWG during the day you should never drop to your minimum.

Get your FC to 5-6 and set your SWG to generate 2 ppm per day. Check FC every other day and tweak your SWG output as needed.
 
ajw22 said:
Target FC in the FC/CYA Levels takes into account the expected daily FC loss. The difference between the target of 5 and the minimum of 3 is the possible daily loss. If you run your SWG during the day you should never drop to your minimum.

Get your FC to 5-6 and set your SWG to generate 2 ppm per day. Check FC every other day and tweak your SWG output as needed.
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Ah, well that makes sense. Glad to hear it.

Will keep you posted.
 
ajw22 said:
Target FC in the FC/CYA Levels takes into account the expected daily FC loss. The difference between the target of 5 and the minimum of 3 is the possible daily loss. If you run your SWG during the day you should never drop to your minimum.

Get your FC to 5-6 and set your SWG to generate 2 ppm per day. Check FC every other day and tweak your SWG output as needed.
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Once I get it to 5-6, I’ll probably error on the high side and set to 4 or 6 ppm per day. Just to make sure I don’t go below. I know it shouldn’t, but just want to be cautious. I’d rather not go through it again.

SLAM isn’t so bad when you have a 30 CYA. With 70 in a SWG, that’s a lot of liquid. :)
 

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