Food grade stainless steel tank includes filter to avoid hair clogs. 1/2 gallon tank will bathe 2-3 pets, 1 gallon will bathe approx 5 pets, 1.75 gallon tank will bathe approx 8 pets, 5 gallon tank will bathe approx 30 dogs, 3 gallon tank will bathe approx 18 dogs and 10 gallon will bathe approx 60 dogs. Tanks are available New or Used.