Ecomatic Salt System..

[SJohnson]

Another thing, you may want to read this before deciding on a pump/filter combo (see link below). . . you need to be especially careful about your pump's water turnover rate when adding a salt cell. You need to run those things at least 6 hours a day to generate enough chlorine and there really isn't any need in turning your water over 3 times in 6-8 hours . . . not saying your oversizing your pump(you're at 21k, right?), but just something to consider . . . a flow rate of 50gpm would turn your water over in a little under 8 hours . . . The general rule for a energy effecient system with good filtration is to oversize your filter and not oversize your pump, don't undersize it either . . . there is a nice balance that can be reached here . . .

http://www.poolsolutions.com/tips/tip83.html

-SJ