CC still high

[JoyfulNoise]

Jack's Magic The Purple Stuff was added prior to 8/17. No idea what's in the water. There's nothing been intentionally or knowingly added.

The Purple Stuff is an HEDP (phosphonate) based sequestrant to control iron and copper scale. It does not cause an appreciable FC demand nor would it generate any CCs. It does, however, breakdown into orthophosphate (PO4) which adds to the phosphate load in the pool water (nutrients for algae growth).

Some pool stores can test for nitrates and phosphates. If it's at all possible that the pivots allow for fertilizer overspray to be carried on the breeze, that is a possible source. Also, if you're filling with well water that is contaminated from fertilizer run-off, that will be a significant source as well. Only testing can reveal what's in the water.

 

[cindyhmorris]

From your original description it sounds like you still have an algae problem. That "sand" in the deep end could be mustard algae. Also, if your CCs were high, then the SLAM was not over as one of the criteria is CCs < 0.5ppm. So even if the water was clear, it doesn't matter, the CCs are still to high. Dosing the pool twice a day to 30ppm may not be consistent enough if the FC drops quickly between doses. Also, when was the last time you deep cleaned the sand filter? Backwashing is fine for routine maintenance but a sand filter can still harbor lots of debris and organics. The sand bed needs to be cleaned thoroughly once per year.



I think the answer is you just need to SLAM your pool and probably babysit it a bit more to ensure that it can hold FC long enough between doses.

Sand was changed in July 2016

 

[JamesW]

I think that nitrogen being introduced is the most likely cause. Unless you can prevent more bein introduced, it's going to be a continuous problem. Phosphates and nitrates are not the problem as long as you're maintaining sufficient chlorine to prevent algae growth.

If you filled from a well, you should be able to have your well water tested. Local resources are provided by the government to farmers and residents for water quality tedting.

If you can prevent further introduction of nitrogen compounds, you should be able to eventually Slam to completion. Without knowing what or how much is being added we can't say how long a Slam will take.

The sand like substance on the bottom might be fertilizer. That would explain why there was more cc noticed at the bottom. Do the pivots spray liquid?

Is it likely that various farming compounds are getting in the water?

 

[melody.boutz]

10 ML of pool water. Add scoop of powder. Swirl until dissolved. Add 0871. Count drops. Swirling after each one. Divide by 2 to get FC. Add 5 drops 0003. Add 0871 again. Swirl after each drop. Count drops. Divide by 2 to get CC. It doesn't smell like chlorine or taste like chlorine at all.He swam in the pool for several hours. No Burning except at bottom...

you mean multiply number of drops by 0.2

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[singingpond]

you mean multiply number of drops by 0.2

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No, with the 10 ml sample, divide by 2 is correct (or multiply by 0.5). If the 25 ml water sample were being used, then you're right that it would be multiply by 0.2 (or divide by 5).

 

[melody.boutz]

No, with the 10 ml sample, divide by 2 is correct (or multiply by 0.5). If the 25 ml water sample were being used, then you're right that it would be multiply by 0.2 (or divide by 5).

oh ok. I always use the 25 ml sample

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[VinDeeLoo]

Why use so much reagents? The 10 ml is fine.


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