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Koi Medic Salinity Meter Pen Quickly and accurately measure salt concentration in ponds. Salt deters algae growth, detoxifies nitrite and eliminates fish parasites and bacterial infections. Extremely accurate and easy to use; simply turn it on and dip it in the pond. Within two seconds, the LCD displays the salt concentration percentages. Successful pond keeping revolves around good water keeping. Keeping a pond clear and beautiful isn't hard if you understand how an ecosystem works. First, anyone who claims all you need are plants, a filter, or a chemical to keep a pond clean doesn't understand how pond ecology functions (or they are just trying to sell you something). To keep water clear, you need a mechanical and a biological filter, plants, fish, and bacteria to work in unison to create a natural working ecosystem. You'll be ensured a crystal clear, low maintenance pond if you use the right ingredients. All of Aquascape's water treatment products are 100% natural.