Small 460x320x330mm HiBlow, to 150lpm, Charles Austen to 150lpm, Medo to 80lpm
Large 610x410x385mm HiBlow 200lpm, Charles Austen 200lpm, Medo to 100+lpm
Protects air pumps electrics and circuits from driving rain
To suit air pumps 40 litre to 200 litre per minute
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Many pump manufactures under estimate the size of pump required, so that it appears a cheaper, smaller air pump of theirs will do the job of a larger competitors air pump.
The tables below have been obtained after more than 40 years experience of how much oxygen is required by bacteria and aquatic life under all conditions. Remember the higher the water temperature the less dissolved oxygen (DO) the water can hold.