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Removes colors and odors from aquariums and pollutants that mechanical and biological filtration leave behind
but hard to find
Maximum air volume per air stone is: 1
Polyethylene
pH Pens by Hanna Part:Calibration Solution 10.01 pH Removes colors and odors fromThese easy to use pH pens from Hanna Industries are waterproof and will float. They feature automatic shut off, temperature compensation, replaceable electrodes, hold function, stability indicator and temperature readings in either C or F . Choose pen with sensitivity in tenths (98127) or hundredths (98128). Pens weigh only 3 oz, measure 7 l x 2 w. Use four 1. 5 V button cell batteries (included). Calibration solutions sold separately.
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