Hello all, long time reader/learner.
Stats to start off with:
30k gallon salt water in ground pool.
I haven't been very concerned with my CH level as I have a vinyl liner. For the last few seasons I have ran it wherever mother nature decided to put it (rain/snow/soft well water). I decided to start following the Langelier Saturation Index from
Pool Saturation Index Calculator | PENTAIR
I decided even though all the other numbers were on target to go ahead and increase the hardness from the old 60 (yes, I heard that gasp) and added 30lbs of CaCL2 over several days to bring it to the current 170 level.
My concern is now for whatever reason I can not keep chlorine in the pool at all. After adding the two dippers, the test water did not change color at all indicating a zero amount. I didnt think too much of it and added an entire bottle of 12.5% NaClO liquid chlorine bringing the amount up to around 5.0 and called it a day.
Today the same thing happened. It tested out at zero. I just got done adding another bottle of the liquid chlorine bringing it up to 5.4 which is the current level.
1) Does adding 30LBS of Calcium chloride eat/kill/not play well with chlorine? and
2) I know from measuring the pool it is about 30k gallons. According to all the charts adding that much of CaCl2 should not have added that much to the CH level.
3) Does adding the CaCl2 affect the salt level? I noticed it went from the normal 3200 PPM to 3300 PPM instantly after adding. (This is more of a chemistry question as the 'chloride' of Calcium Chloride I assume is the same as in NaCl only it has two atoms of chloride compared to only one)
4) Finally is the NaClO final 'O' one atom of oxygen making it sodium chloride and oxygen to form sodium hydrochloride?
To be honest I enjoy balancing the water and the chemistry that comes with this more than I do actually using the pool.
Thanks in advance!