Just a note on sealing before you spend $ make sure it's not already sealed.
If the water doesn't bead, look to see if the water darkens the grout pretty readily or not.
I find that some sealers don't make the water bead much, but still keeps the grout from darkening with the water.
If the grout quickly darkens with water (like water darkens a dry concrete sidewalk), it's not sealed.
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Nova Water filters
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