I always tip my SS tank and pour chems in. Somewhere from 30-40degree angle and don't try to dump it in all at once. It only takes about 5 or 6 seconds to fill a single 35mm tank. Also, check the fluid level of your tank with the reel in and the top off(no film of course) to see how much actual chems you need. If you overfill the tank you won't get proper agitation. You only want to just cover the reel so there is an air space. Fill to just covering then dump liquid into a measuring vessel to get a reading.