Citric Acid - 16oz by Atlas Preservation Save Liquid error (product-badge line 32): -Infinity% $8.50 1 2 3 4 5 6 7 8 9 10+ Quantity Quantity Add to cart Citric Acid is a retarder made of 100% food grade and is the most efficient setting retarder for natural cement. Its use is indispensable for the workability of the cement laying or pouring.