Sand filter medium

[mknauss]

Do the CH test again. Use a 10 ml water sample.

Calcium Hardness

A drop-based test that measures the hardness in your water. Once measured, it is used … Read more…

www.troublefreepool.com

 

[TRUK71]

I'll redo in a bit....but if it takes 34 drops on a 20ml sample wouldn't it be logical to assume it'll take 17 on a 10ml. So it would be 425 if that is correct.

 

[mknauss]

34 drops using a 25 ml sample would be 340 ppm CH. If you use a 10 ml sample, it should be about 14 drops.

 

[TRUK71]

34 drops using a 25 ml sample would be 340 ppm CH. If you use a 10 ml sample, it should be about 14 drops.

Yes. Sorry. I'll retest in about 30 minutes to get accurate number

 

[TRUK71]

14 drops it was. So 350.

 

[TRUK71]

Merged threads.
I've been told to use muratic acid as a phDown. I've also been told that muratic acid will make Sodium bisulfate drop calcium out of solution.

So is muratic acid ok to use?

 

[mknauss]

OK -- well, the data says your system should not be generating any scale, or at least the amount you are seeing.

Do you manually vacuum the pool or have a cleaner? It should be picked up by your cleaner.

 

[TRUK71]

We clean it with a robot vacuum. We've even vaccumed to waste. It just comes back next day.

 

[Cwiggs]

muriatic acid is fine and it works to lower pH. phDown is sodium bisulfate, so it will increase sulfates in your pool where muriatic acid won't. However you don't want sulfates in your pool.

You can read more about TFPC recomended chemicals here: Recommended Pool Chemicals - Trouble Free Pool

 

[mknauss]

Wow. I cannot see how that is all calcium scale. Something else is going on.

 

[mknauss]

I've also been told that muratic acid will make Sodium bisulfate drop calcium out of solution.

Where were you 'told' that?

 

[TRUK71]

From the pool manufacturer River pools.

 

[Donldson]

Can you take a sample of the substance and put it on a white surface and get as clear a picture as possible? Something seems off about it.

 

[TRUK71]

Yes. Running vaccum now then I'll take picture.

 

[JodieM]

@mknauss what would cause his calcium to be dropping from suspension and sit in the bottom of the pool everyday?

 

[TRUK71]

@JodieM were actually discussing that on a different post. It's under "sand filter medium"

 

[TRUK71]

I don't think the 2 are related because I haven't used Muratic acid this year. Just phdown.

 

[mknauss]

pH Down is sodium bisulfate. That is not good with a SWCG. It will shorten its life span. Also, if the sulfates get high enough, it can create calcium sulfate. But it is not very soluble in acid so your other thread said what you show is soluble. I am merging the threads.

 

[TRUK71]

My TA this year has been 110-130. Could that be causing the issue?

 

[TRUK71]

I will say there is less of it this morning than usual. I'm doing a slam because my salt cell was left off and created an issue. So maybe doing the slam is helping?