Increasing CH Opinion Needed

[Ckdavisusc]

I am working to get my CH up and have the below bag in the storage shed left from the previous pool owner. There are no ingredients listed, but this appears to be Calcium Chloride based on the bag label. Has anyone seen this brand before? Is it safe to use?


Fc 8
tc 8
Ph 7.7
Ta-60
Ch 260
Cya 50

Gunite pool(replastered 7/2016), 20,000 gal, heyward s-240 sand filter, Polaris 280, Pure Chlor SWG

 

[pooldv]

Yes, that is fine to use.

 

[Ckdavisusc]

There was some labeling on the back that said it was 77% minimum. I used the Calcium Chloride dihydrate suggested measurement in Poolmath to determine the amount to add.

Thanks again for the input.

 

[duraleigh]

Why are you raising CH??? 260 is fine. Please don't add any more.

 

[Ckdavisusc]

Yikes, I added enough to get me up to about 310 or 320. I am basing this off of the recommended levels in the water balancing area on TFP for an SWG plaster pool. It states the level should be between 350-450.

i added about 12 lbs of Calcium Chloride dihydrate earlier today.

My numbers prior to adding today were:
Fc 8
ph 7.4
ta 60
ch 260
cya 50

What do you recommend I do?

 

[needsajet]

You'll be fine, don't sweat. You can let your pH rise a bit (7.7/7.8 would be good) assuming your water is around 70/75F these days. You're doing great.

 

[pooldv]

+1 it's all good.

 

[duraleigh]

There is no harm in raising your CH to that level. That said, it will tend to rise slowly on it's own so please do not add more.

The CH suggestions in that chart are under review.

 

[Ckdavisusc]

Ok. I checked yesterday evening and the CH level was at 310. I won't make any further adjustments. What causes the CH to rise on its own? I don't use CH based Chlorine tabs and my fill water has CH of 40. Does CH not evaporate with water?

 

[pooldv]

Correct, the Calcium stays as the water evaporates and you add more CH with new fill water. Things that don't evaporate are CYA, salt and CH.

 

[Ckdavisusc]

Going back to what duraleigh notes above, I think it's definitely worth noting in the recommended pool levels for CH with an asterisk or something that CH will rise over time and that you should start at some number (ie,200) and let it drift up, ideally hitting the 350 to 450 mark. Of the "non-evaporate" chemicals, CH seems to be a bit more tricky to manage than CYA or Salt since most folks fill water will add to CH over time.

Thanks again to the forum for the insight and suggestions so far.