One of the most intelligent dosing pumps available is the Neptune DOS Fluid Metering System. It will connect straight to your current Neptune Apex, ApexEL, or Apex Jr., allowing you to independently set both pumps for any type of dosing your tank may require. The most popular two-part dosing method is made possible by the DOS pump's two pump heads, although it is not the only two-part dosing method possible. It can be used for metered liquid food dosing, tiny trace element additive dosing, automatic weekly or even daily water changes, and pretty much any other liquid your tank may require.
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