A standard 20kg bag of grout will cover approximately 2.5 square metres - depending on how thick you apply it - these figures are for a 5mm thickness.
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How many square feet will a ton of salt cover?
9 square feet.
190
1,440 square feet or 160 square yards.
If that is 2' x 4' it would cover 800 square feet. If it is 2" x 4" it would cover about 5.5 square feet.