compost the mineral media and place the plastic housing in your curbside recycling bin

tool-free replacement

Power: 2 × AAA batteries (included)

Changing the Filter

HM Digital COM-100 Waterproof EC/TDS & Temperature Meter survival water filter compost the mineral media andHM Digital COM 100: Waterproof Professional EC TDS Temperature Meter The COM 100 is a professional grade EC TDS Temperature meter engineered for precision water quality testing across demanding applications from hydroponics and aquaculture to laboratory analysis, water purification, pools, spas, and industrial water treatment. Key Features Measures Electrical Conductivity (EC), Total Dissolved Solids (TDS), Salinity, and Temperature 4 Measurement