Thanks for the replies. I use shock only about once every month, now that we no longer have a neighborhood full of kids. Just my wife, me and a few friends now. That sure makes it easier. I will take your advice and keep an eye on the CYA.
When we get back from the beach, it seems like we get hit with algae. We'll wash all of our bathing suits and give it an extra blast of chlorine this summer.
thanks,
Rusty