Milwaukee Instruments MA957
Milwaukee Instruments comes from the measurement side of the hobby, and the MA957 regulator is built to work with its MC122 pH controller: the controller switches the solenoid, the regulator holds pressure and the needle valve sets flow. Typical dealer pricing sits around 169 dollars, which places it between throwaway kits and boutique dual stage units. The design is plain, industrial and easy to service, and it turns up as often on reef calcium reactors as on planted tanks.
The obvious pick for anyone building pH controlled injection, since the parts are made to talk to each other. It is a single stage regulator, so output creeps as the cylinder empties and a check of the bubble counter near the end of a bottle is wise. Fine tuning at very low bubble rates takes patience compared with a precision needle valve.
Pros
- Designed to pair with the MC122 pH controller
- Solenoid built into the unit
- Mid range price around 169 dollars
- Simple industrial design, easy to service
- Backed by an instrument maker
Cons
- Single stage, output creeps as cylinder empties
- Needle valve less precise at very low rates
- Plain looks next to boutique units
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