How far away? I have my ATO pump about 45 feet away, so I had to use a diaphragm pump, but if you are fairly close a nice peristaltic pump like the BRS dosers are a decent price. How many pumps, the spectrapure are supposed to be very nice as well, if you want to throw down some cash the DOS can be programmed from your apex, but silly pricey IMO (that doesn't mean I wouldn't love to have them).