I have heard good things about the Drew's Doser on BRS. I know that the Aquamedic dosers are junk from the reviews of most users and one of the things I have read is important is the number of rollers to prevent back flow. I think the Drew's doser has 4 rollers if I remember correctly.
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Mark...
290g Peninsula Display, 425g total volume. Setup Jan 2013.
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