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- Feb 14, 2019
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You have DOS replacement heads. What is the frequency? I thought that was suggested if you are doing continuous water changes or used for automatic. Not traditional dosing.
That does not mean traditional dosing heads do not need to be replaced but I thought they had a longer shelf life.
Russ M. posted this over on the Neptune system Forums. I hope this helps. I've seen numbers double what he has stated when dosing fluid slowly over longer hours as opposed to faster larger fluid dosing:
"Please allow me to correct some incorrect info here. The DŌS manual does not state that the life of a pump head is 5000 hours. The DŌS product web page does give a figure of 5000 hours, but that is the MTBF (estimated mean time between failures) of the stepper motors, not the pump heads; MTBF is not the same as service life or a recommended replacement interval.
The useful life of a DŌS pump head is highly dependent on how it is used. A pump head which is used for dosing of small amounts of liquids at low speed (such as 25ml/day of an additive at very low speed) is most likely going to last longer than one used in a manner which is going to have more wear and tear, i.e. for extended operations at high speed (such as larger automatic water changes)."