We have supplies for marine & freshwater aquariums, planted tanks, & ponds. Many of these supplies can also be used for aquaculture and aquaponics. These supplies include pond filters (box, canister, filter brush, koi mat, uv), aquarium filters like canister filter and uv, submersible water pumps , aquarium chillers , aquarium salt for saltwater / marine / reef aquarium , etc. Our water testing digital meters for pH, DO ( Dissolved Oxygen ), TDS Total Dissolved Solids , EC Electroconductivity , salinity , ORP Oxidation Reduction Potential & refractometers have wide application. Brands: Atago , Sunsun , Grech , HM Digital , Blue Treasure , American Marine , Milwaukee Instruments