homemade grout

Grout is just sand and Portland cement mix and water, if you don't want the oil-resistant, fungus-resistant, God-knows-what-else additives grout makers put in there to make it more poisonous, uh, I mean, better.

We are adding AFM's grout sealer or safe seal for some of the water, but neither one hurts me. Go AFM.

Other exciting information: local sand hurts me. Silica sand doesn't. It just follows one of the Great Rules of Environmental Injury (EI): if there's a more expensive option, that's the only thing an EI will tolerate.