Yes. I flush with Sledgehammer (2 tsp/Gal) approximately every 4 weeks. I don't use as much water as they recommend. In a 5 gallon pot you should be fine with 5 to 7 gallons, maybe even less. As long as you get a good run-off, you should be ok. I usually flush my 3 gallon pots with 2 to 3...