Hydrosep® Water Treatment AdditiveEconomical treatment additive controls bacteria, algae and fungi in eye wash water for up to six months. Additive controls bacteria, algae and fungi in contained potable water for up to 6 months Unopened preservative has a shelf life of up to three years Each economical treatment preserves up to 20 gallons Regardless of preservative, we recommend that portable eye wash units be flushed, cleaned and the water replaced every 30 to 90 days Style Solution