Fertilizer won't impact hardness or alkalinity---your ag lime will take care of that.

You achieved such clarity because you had nothing but suspended clay in the water which was preventing an algae bloom. The idea was to clear ALL the suspended clay, which you have done. Restarting your aerator will cause some minor turbidity at first by drawing some nearby floc into the circulation, but it should quickly clear right back up (within hours).

Get your Ag Lime in and allow it the time to work it's magic. You may not need to do as much next spring as you think. I'd think it's too late in the growing season to reasonably establish any plants now.

Edit: An Alum application is probably the only thing you will ever do to a pond that will have results quickly. Nearly anything else you will do to it takes time to see results---often years!

Last edited by Rainman; 09/12/10 12:51 PM.