my expereance with phoshate reactor is that they can't handle any back preasure or they leak out the o ring seal. So you can't put the reactor inling from pump to tank but you can "t" off the return pump and use a ball valve to divert some of the return to the reactor and then back to the sump. That's how I have mine setup but my 2 mag 9 pumps were a little to much and I had the tollet flush on my 220gal with both pumps at 100% return.
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220g mixed tank
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