I have just finished spraying my daylilies down in the bog and all my hostas with my 1gal sprayer with a mix of ammonia and water, 12 cups water and 1 cup ammonia (that was not a full gal. ) it was enough to do the remaining plants that had not been sprayed earlier.I had been using a 1qt. spray bottle but as the plants have gotten much larger I was having to fill it three times, now I decided to go to the larger sprayer. I buy the ammonia at the dollar store for $1.00 a bottle, and I like to get the lemon because it has a little color to it and I know immediately that is the ammonia spray. My plants are not 100 percent slug and snail damage free, but compared to last year this is very satisfying, a very small percentage of the leaves have any damage. I have not yet figured out just how often I have to spray, twice a week I think will work, and I hope to get down to once a week. Later in the year I might not have to spray at all?