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Thanks I will take a look at those. I was interested in the cole parmer because I have found them new for about $250. I was hoping some folks had some experience with them.
There are several different methods of running a CaRx. You can use the constant drip, variable pH method. In this method, you don’t necessarily need a peristaltic pump as you can use an MJ1200 or a manifold off of your return.
Or you can go with the more traditional method of keeping your reactor pH between 6.5 - 6.7 and dialing in the appropriate effluent drip rate for your tank’s consumption needs. In using this method IMO, a variable speed peristaltic pump like a Masterflex or Watson Marlow is invaluable to maintain a consistent drip rate without the annoyance of having the effluent line clogging every few weeks (especially at the slower drip rates).