how often do you replace the stones
ok so now as we know thy are great, how often do you replace the stones, or do you sand them off a bit for a nother few weeks.
only down side I would considder is the nois of the air pump.
I used a 40W comp. to feed my needel W. with air, as my skimmer is tall, and hate the sound.
gust ordered a laguna 2900 to build a mesh wheel, thy should handel the suction of air, so I loos the compressor.
however you never know in the future, so always interested to find out how long the w. stones last
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