BlueSeal - Its what makes No-Flush urinals work all over the world!For the past 25 years, BlueSeal has been our long lasting and biodegradable trap seal liquid. It is what we are known for. BlueSeal has a specific gravity lower than water or urine. In the EcoTreap cartridge it floats on top of water/urine and so makes a complete seal. It therefore remains for an extended period of time in the trap even with urinal use (small amounts do get carried out with each urinal use). Otherwise, with no use to the urinal or little use, such as in outlying facilities, BlueSeal remains indefinitely in the trap sealing trap odors.BlueSeal has zero evaporation at 100 degrees F and does not freeze above -70 degrees F. Typical winterization costs can be eliminated by installing our Waterless No-Flush urinals.Commercially available cleaners will not harm the BlueSeal in the EcoTrap, meaning no special cleaners need to be purchased.