Aquatic essential calcium reactor how to?

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In my experience a feed pump is necessary. A reactor can easily lose suction without it and will then no longer work until the situation is corrected. A little pressure also makes it easier to maintain a steady flow rate.

A pH probe port can be purchased from Home Depot or most other hardware stores. The hard part is then finding a large tap to thread a hole for the fitting... https://www.homedepot.ca/en/home/p.f...000124751.html