I'm reading with great interest all the stuff in pool school. I have a background in chemistry and I've long known that water chemistry is almost a field of it's own. But I would have never guessed that pool water chemistry is almost a field of its own also. You folks have done a superb job of translating things that are over my head to practical understanding/applications, while staying technically correct. I'm so appreciative of what you do here. So here's my question. As I look through my local pool supply stores I find most pool shock products seem to have the calcium hypochlorite compound. But it seems to me that is adding to potential CH and makes it hard for me to stay true to the TFP philosophy (add only what I really need) unless I really want/need the added calcium. So it seems to me that I should just add to FC using liquid bleach or trichlor (my CYA is pretty low) and stay away from the shock products that really seem to have the wrong shock products. Am I getting this right. I don't see the need to shock right now I'd just like to know if I'm getting this right. By the way, I've also taken to seriously the recommendation that I do a lot of frequent tests to really understand my pool. I bought the TF-100 and here are my results as of yesterday:
Date TA CYA FC CC CH PH 31-Oct-15 130 <20 20 0 225 7.6 1-Nov-15 130 <20 18 0 225 7.7 2-Nov-15 100 <20 14 0 225 7.7 3-Nov-15 90 <20 12 0 250 7.5 4-Nov-15 90 8 0 7.5 5-Nov-15 90 7 0 250 7.6
By the way my pool looks fantastic and I let the pool company go last week as well. I've had to go 7 days with no chlorine added to finally get to single digits! PH fluctuations may be partly my color shade errors. I got a great hint from a member here to use a white background and it's really helping.
Thanks in advance for any comments.