The DTA Grout Sealer 500ml is a non-hazardous, bleach-free liquid that penetrates pores in porous grout to help resist dirt and stains. Sealing in grout is the best way to protect it from damage. Protect the grout in your home or bathroom from staining, which can happen if moisture gets under the grout.Protects grout from stainingNon- hazardousEffectively waterproofs grout