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[APD] Cheap CO2 controller

I was just wondering, since 90% of recent posts involve CO2 reactors, if anybody has any comments about a eleven-year-old CO2 controller design at http://www.thekrib.com/Plants/CO2/co2-pvc.html which, as low pressure solenoids can apparently be very cheap, could be a very economical way of having automatic CO2 injection (I have very soft water and like it that way)?

Andrew McLeod
thefish at theabyssalplain_freeserve.co.uk
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