Cyanuric acid heated up and dissolved almost immediately

[mokonack]

My pool went neglected for a few weeks as our first child was born last month (I added bleach/acid sporadically but not with any precision).

Now I have a bit more time to get everything balanced. My pH was about 8.5, FC 0, and CYA was almost 0 which was a surprise since I had added about 4lbs a few months ago to balance everything. So to start with, I added a half gallon of muriatic acid and put 4lbs of cyanuric acid in a sock in the skimmer. I spent another 30 minutes brushing and cleaning the pool vacuum and went back to check on the sock. To my surprise more than half had already dissolved. I squeezed the sock and it was extremely hot to the touch as if an exothermic reaction was underway. I’ve never seen CYA dissolve so quickly nor had it heat up. Has anyone else had this happen before?

 

[ajw22]

You sure you added stabilizer and not calcium?

 

[Richard320]

You sure you added stabilizer and not calcium?

That was going to be my question!

 

[mokonack]

Oh Crud.

I always order my CYA on Amazon from the same retailer. I should have looked at the box this time more closely - they shipped calcium instead of CYA. Arghhhhh.

Well, at least now I know what’s wrong but now I have to drain a ton of pool water. Sigh.

 

[jblizzle]

What do the calculations indicate that you raised your CH to? I would not think it was enough to warrant a large water exchange

 

[Richard320]

Oh Crud.

I always order my CYA on Amazon from the same retailer. I should have looked at the box this time more closely - they shipped calcium instead of CYA. Arghhhhh.

Well, at least now I know what’s wrong but now I have to drain a ton of pool water. Sigh.

Probably not.

Use Effects Of Adding Chemicals at the bottom of PoolMath to see how much CH you just added. Probably not as much as you think.

 

[mokonack]

My CH has always been somewhat on the high side (~350+). This is also the second time I’ve added 4lbs as I used the same box last time. I unfortunately wasn’t paying much attention last time due to baby prep so didn’t measure CYA after adding.

I’ll let the water turn over and see what the CH is in the morning to determine what to do.

 

[JamesW]

Probably not a problem. What's the pool volume?

 

[mokonack]

About 12000 gallons.

 

[mknauss]

8 lbs of calcium chloride to 12000 gallon is about 70 ppm CH. Not a big deal.

Was this Puritech?

 

[mokonack]

Was this Puritech?

Yeah, puritech.

My CH today is up at 550, though the water doesn't show any signs of cloudiness. I will likely just live with it unless the water gets cloudly, but now I have to wait for more CYA to arrive.

 

[mknauss]

I would be wary of that company. This the second report this year of mislabled chemicals from them.

 

[mguzzy]

Big pass on the wrong chemical... new Dad's always have something else on their minds!

I had a roomie once try and help with chorinating the pool... he grabbed a jug at random and dumped it in..turned out to be MA.

Congrat's on the new pool user in your house!

 

[mguzzy]

I would be wary of that company. This the second report this year of mislabled chemicals from them.

So was the box itself mislabeled or just the wrong item was shipped? I order Puritech via Amazon as well. Then divvy my 25lb order into smaller 8lb buckets for later.

 

[mokonack]

I would be wary of that company. This the second report this year of mislabled chemicals from them.

This wasn't a case of mislabeled chemicals, but of a combined screw up - the seller shipped the wrong item and my new dad brain didn't read the box until noticing it dissolve and heat up.