Grout Boost? stain resistant grout additive mixes with cement-based grout in place of water when grout is installed to provide resistance to water and oil-based grout stains. 48 oz. (1.42 L) plastic container to be used with 8 - 10 lb. bag of unsanded grout. Also available on 70 oz. (2.07 L)see bag specifications for mixture.