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Cal Aqua Double Counter

$28.99
CAL AQUA's Double Counter functions as both a normal-flow and high-flow bubble counter in one elegant design. Normal-Flow Configuration: For small to medium sized aquariums where CO2 bubble rates are not as high, the normal flow mode can be used to...
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Cal Aqua Double Counter ER

$38.99
The Double Counter ER functions exactly the same as the original Double Counter but has an external port for quick and easy filling. Over time, water level inside bubble counters will evaporate due to the constant stream of dry CO2 passing through. This...
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