Hasa 90121 1 pt Bottle Hi-Temp Eco-Safe Water Clarifier 12 per case. Hasa Hi-Temp Eco-Safe Water Clarifier causes tiny particles of debris in spa water to coagulate (join together) so that they may be readily removed from the water by the filter. The brilliance and clarity of spa water depend on the efficient activity of the filter as well as the chemicals used to sanitize the water. Hasa Hi-Temp Eco-Safe Water Clarifier may be used in any fiberglass, vinyl, plaster, tile, or acrylic spa.