Found the extended tests so will redo the Calcium. At the moment, I do not have an SWG. That is scheduled to be installed June 22nd. As for the pool store, they are not maintaining the pool directly. I actually switched to a different pool store last year. It is Leslie's. For the most part, I was happy with the way they helped me maintain the pool. I did go thru a ton of chlorine last year which is one of the reasons that I have been looking at SWG's. Apparently, they saw a high usage in chlorine last year as compared to some of their other stores. I will say that they did not constantly push chemicals at me. But, I will also say, I made sure to only deal with one particular person who is not a kid and has been very practical in his recommendations, oftentimes ignoring or crossing off what the printout recommends. If he were to leave that store, then I would be reluctant to continue to go to them. So, in a way, they are "maintaining" the pool.
For what it is worth, I went away from the first pool store because I got tired of the focus on ammonia, draining the pool, etc. Interesting enough, my pool is known as the mystery pool. I can get FC and TC readings using a Taylor kit. Leslie's usually matches what I get. The other pool store shows NO chlorine in the pool. We went thru a lot of gyrations and they are now convinced, for some unknown reason, that their tests do not show any FC even though I show that there is. In fact, what was really wild is I had water left in the bottle that I took to Leslie. I stopped by to talk to them about the SWG and they ran their tests. They even used a Taylor test kit and it showed no FC. They gave me all of the Taylor agents so I could retest at home. I came up with FC in the pool using their agents and mine. This really has them baffled.
Right now, the pool is crystal clear and has been since I opened it (after adding chlorine, running the filter, etc). I am just trying to improve my overall knowledge of all of this and I do find that I am getting "pool smarter" as each pool season happens.