ive been using a marine magic doser for around 2 years now. it has worked awesome for me. just a heads up, extra internal tubing for the pump is definately a good thing to get. the other weekend i noticed my alk starting to drop and noticed that the doser had plugged off and was wearing on the tubing for a while now. no biggie as the replacement pumps are $13, but i wish i had some spare tubing to replace it with.
for the money, its well worth it.
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