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In an aquarium
The Hanna Marine Calcium Checker® bridges the gap between simple chemical test kits and professional instrumentation
Well many devices out there make use of what are called capacitive touch pads
K+ ELEMENTS - contains cations of the trace elements barium
1LINK CABLE
MarinePure Media Spheres 1.5" - 1 Gallon SPS In an aquarium1" Spheres Designed for Ammonia and Nitrite Removal One MarinePure Sphere has the same surface area as 1,350 plastic 1. 5" bio balls. Use in canister filters, sumps, and wet dry filters.
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