The first non para urinal block works like para in its elimination of urine salt odors and cleans de scales de limes deodorizes and maintains the fixture and drain lines Features . Blue spice screens and pucks. The first non para urinal block works like para in its elimination of urine salt odors and cleans de scales de limes. deodorizes and maintains the fixture and drain lines. Acid stable enzymes neutralize the formation of ammonia which causes urine odors. Removes corrosion and uremic salts. Last up to 30 days. VOC compliant Specifications . Dimension 3 75 H x 11 25 W x 16 25 L. Weight 3 4 lbs