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The HI736-25 are the replacement reagents for the HI736 Phosphorus Ultra Low Range Checker® HC
they should be added to correct any decrease in alkalinity or carbonate hardness
minerals and electrolytes found to be essential for the natural growth and function of healthy nitrifying bacteria and heterotrophic bacteria
But a lot has changed in the meantime
Magnet Mount: Up to 1/2in thick
Watchman Goby (Pink/Blue Spot) lighting The HI736-25 are the replacement
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