re: MSM Application Question

If it were me, I'd fill it with 1g of regular water, mark off a 31' x 31' area, and spray like you're saying. After 1 pass you can get a good idea (based on how much left in tank or if you run out too early) about if you need to walk slower/faster, or increase/decrease the span of your swaying side to side, etc. Shouldn't take more than a few minutes.

If you don't do this, you risk spraying too little and wasting your time, or spraying too much and nuking good grass.