Cell Cleaning - Acid to water ratio using 10.5 MA

Yorker

Silver Supporter
Apr 22, 2017
489
Cathedral City, CA
Hi all! Our pool is almost three years old, and so simple to maintain thanks to all of you at TFP.

I do have a question. In the beginning I was checking our IC40 salt cell every three months, all it needed was hosing off for small leafs and debris. The second year I started checking if every 6 months and would see a tad of calcium buildup, but that too would rinse away with a hose. I've been lax and it has been about 8 months and when I checked today there was a lot of calcium buildup (in my opinion .. see attached). The before photos are before hosing off, but the hosing did not knock off hardly anything.

So I prepared a 1:4 MA(10.5%)/water solution and filled the cell. The water remained clear with only a slight trickle of bubbles. I emptied it into a container and rinsed the cell, I assumed the 1:4 ratio was probably for 30+% acid that you get from pool supplies, so I added another 8oz of MA to the solution and tried again. No improvement. I repeated by adding another 8oz. At this point it was about a 1:1 solution, still no change, just the same ever-so-slight amount of small bubbles.

I went and dd another pressure wash with the hose and the vast majority of the buildup came off, leaving a small amount on one side of the cell (see the After photo). I decided to reinstall the cell, and check-in with you.

What should be the mixture of 10.5% MA to water?
Is it okay to just leave the remaining buildup on until the next cleaning?
Lastly, I read on a post here that someone mentioned using a wooded popsicle stick to knock off stubborn deposits. Is that safe?

Thanks in advance,
York
 

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My cell actually came with a wood stick for scale removal. It's about the same size as a paint stirrer . If you have a paint stirrer or a Popsicle stick you should be able to knock off the scale without damaging the plates.
 
Yes...a couple times. When I had to clean mine, I rinsed with water and broke loose a couple scaled areas on the electrodes. This seems to be the only area on my cell where I get a bit of scale.
 
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With that weak of MA, 10.5%, I would use it almost 1:1. The 4:1 ratio is for 30% full strength acid. That said there wasn't too much buildup of calcium to begin with. I would use a stick and scrape it off and not bother with an acid bath.

You have other issues going on with your filter, there shouldn't be any debris like you are seeing with a properly working filter.
 
Thanks AJW. I did read that, but it does not mention the strength of the MA.

Since 1:4 of 10.5% MA did not produce a reaction more than a few bubbles coming from clear water, as well as 3:4, I'm confused. If the 1:4 is for contractor strength MA 30%, then I might assume that 3:4 of 10.5% would be in the ballpark. But that got the same reaction.

Maybe the amount of buildup in my before photos was not an indication of the need for an acid wash.

Thoughts?
 

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You have other issues going on with your filter, there shouldn't be any debris like you are seeing with a properly working filter.

Thanks for the confirmation ping, that's what I was thinking about the MA. The debris happened well over 18 months ago, could it have been because the filters were pretty dirty and the was lots of sand in the filter at that time?
 
Thanks AJW. I did read that, but it does not mention the strength of the MA.

Since 1:4 of 10.5% MA did not produce a reaction more than a few bubbles coming from clear water, as well as 3:4, I'm confused. If the 1:4 is for contractor strength MA 30%, then I might assume that 3:4 of 10.5% would be in the ballpark. But that got the same reaction.

Maybe the amount of buildup in my before photos was not an indication of the need for an acid wash.

Thoughts?

They are assuming 30% MA.

As ping suggest do 1:1 with 10% MA.
 
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Got it with the old pictures vs new pictures. The filter seems to be fine now so don't worry about that.

There wasn't that much calcium buildup to begin with, hence few bubbles. Next time use the stick and call it good.
 
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