Thanks for the input. Just found out from my son that he also put about a quart of algaecide 40 in my pool during the opening (while I was out getting a part) -- so too much algaecide was probably used (which it seems is contributing to my problem). I've learned more about pool stuff in the last 24 hours at this site than I've discovered in 30 years of owning various pools. If I'm interpreting your input correctly you seem to be suggesting bleach as an inexpensive shock alternative. This has been a revelation for me and is clearly much less expensive than shock. I've ordered the test kit at Amazon so I will give you some readings when it arrives .... but I'm hopeful to have some FC reading before it gets here. Thanks again!