as a plumber, if you can hook one of these to an existing septic tank (or holding tank) as a retrofit for a reasonable price it would be huge, i would like to know how long the biofilm lasts and what sort of maintenance it requires, also the domestic treatment plants currently run into the tens of thousands to buy and install, what would be the cost for a household sized unit? The EGR model looks very cool as it runs itself on its own electricity!
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