Thanks, Watermom.

I'm familiar with the two pieces you linked to in your reply. I guess I don't understand the workings of the muriatic acid, though. Is the basic dose (1/4 gal per 10k gal) the same regardless of the change I want to accomplish in my pH? I gather I'm going to have to lower it somewhat substantially as I set up for lowering the alkalinity.

Also, any thoughts on effective aeration using the equipment I already have?

Thanks again,
Mark