I Permaclean applied with a watering can on a large gravel area. The yield amounted to although it by no means given 50 square meters, but maybe for one-tenth. So I just always refilled water. But even with this diluted solution the plants discolored after a few days and finally were received. A few points I treated three weeks later again, it was brown, too. Hopefully the Wirskamkeit also extends as indicated for the next six months on the ground so that no hint seeds rise. Practically the sachet - simply enter the water, they dissolve even then on. Also noteworthy is that I had ordered the items on Sunday evening, on Tuesday came the consignment already.