Dont know about crystal alum. Not familiar. Make sure you are getting aluminum sulphate, incorrectly referred to as alum. You should be able to get it in 10# bags. You may have to get larger quantities ordered. As I wrote, long term solution to lack of alkalinity/hardness thus lower ph is ag lime which will take several months to have the desired results, but will be help for 2 or 3 yrs. depending upon the amount of acid rain and runoff.
Last edited by burgermeister; 08/29/10 01:53 PM.
