Ca reactor feed question

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Just bought a MJ400 to feed my reactor but now wondering if there would be any problem in just tapping into the output of my return pump (Iwaki70RLT)?

Have some couplings on the 1" line on the output of the pump, thinking drilling into one then tap in a 1/8" MPT/John Guess type fitting. No plans for the 1" valve on the tee, but don't want to use it.

Effluent rate would be controlled from a valve on the outline of the reactor.