Bill,
I did use aquashade early in the year and have not replenished it yet and also don't plan on it. The way the pump is set up it would be hard to shut it off on a daily basis. I wish I would of know that last spring when I installed everything. The one thing about runnning the aerator 24/7 is that it does keep the top of the pond looking nice and my wife likes it, so keeping the peace might be worth the rebuild kit every 10,000 hours or so.