Hi, and welcome!!

One thing that you'll have to deal with is the iron--you can either add metal sequestrant to keep it from falling out of suspension and staining your pool, or you can filter it out by running it through a high chlorine area just before it hits your filter--so that it falls out and stains the filter instead. If you'll take a look at some of the threads in the"metals" section ( you may have to log out to view them for a short time), there are several threads that address removing/dealing with the metals.

Metals aside, I definitely would NOT use the stabilized tabs this year. Rather, I would switch to bleach. Your CYA is very high--but can be dealt with by running higher chlorine levels to compensate. For a CYA over 100, that means keeping your chlorine ine the 8-10 ppm range to keep the algae away. Note that the metals will have to be dealt with first, though, because at chlorine levels that high, you may end up with staining if you don't. The alk is a little high, but can be lowered via the method stickied in the "alkalinity and calcium" forum, using muriatic or dry acid.

Hope this helps--at least should point you in the right direction!!

Janet