Electrodes, TENS, Misc. - Aquasonic 100, Ultrasonic Gel, 8.5 oz. Dispenser, Case of 72 : Aquasonic 100 ultrasonic gel is a water-based that is non-staining, hypoallergenic, bacteriostatic, non-sensitizing and non-irritating. Recommended for all procedures where a viscous gel is required.