I understand the problem. I'm lucky now; our well putrs out crazy water, I could let the hose run for days without drying it up. When I was a kid though, our well sucked at one house I lived in. During the summer, you couldn't do 2 loads of laundry in a 24 hour period if you wanted to take a shower that day - the well would run dry pretty easily if we weren't careful. You'll just have to find out a little information about your water supply as stated. The other thing you might be able to do if its a serious problem is run a trickle into a holding tank for water changes so you take out the water slowly, rather than a large quantity at once.