Living in a temperate rain forest we commonly have dirty water at certain times of the year. I have found that the grit is only of importance during the final rinse and the most inexpensive way to solve this is to buy a large jug of filtered or reverse osmosis water from any large supermarket. In Canada, Safeway provides filtered water refills for about 55 cents US for 4 liters. After washing the film just rinse two or more times with the filtered water. I get perfectly clean negatives without having to mess them up with junk like PhotoFlo and this amount will do about 5 35mm films - pretty cheap.(posted 9544 days ago)