mike,forgot to answer the gypsum and lime question,answer is no.gypsum is the same stuff as sheet rock you have in your house,if you can find a house being built get all the pieces of sheet rock left over and you can use them.my wildlife & fisheries guy was the 1st person to tell me this,yes i thought he was crazy.it does float for about 1-2 days but it will brake down a work,it's free also.i think the 1 time i used it we put about 500 pounds per acre.forgot to say in early post,your water will clear in time if you do nothing at all,if you have grass around edges,however it takes TIME.if you are like me you dont want to wait than go to plan b,$$$$$$$
