Hanna Ammonia Low Range Checker HC Reagents (25 Tests) RIO They have a 1-1/8″” crown

They have a 1-1/8″” crown with a 7/16″ base and fit perfectly into standard eggcrate or into small cracks or crevices in live rock

Inlet : 25/34 mm

because from this point of view every pond filter or the whole aquarium is "unnatural"

Alkalinity should not be allowed to fall below 2 meq/L

and water conditions vary in many aquariums

Hanna Ammonia Low Range Checker HC Reagents (25 Tests) RIO They have a 1-1/8″” crownThe HI700 25 are high quality reagents that are pre measured, allowing for users to achieve fast and accurate measurements with their Ammonia Checker HC. These reagents follow the Nessler Method in which the reaction between ammonia and reagents causes a yellow tint in the sample. By simply adding 4 drops from each bottle of HI700 25 reagent set to the sample, the reaction will take place and the HI700 will determine the concentration from the color