Not used, but Eli (caco3reef) carries a type of reactor that looks like an RO system container that doesn't require sponges and is really easy to clean out. Lenny has the same ones except from BRS (i believe) and runs them off her return pump using a tee and ball valve and she loves them just for the ease of changing the media compared to the TLF type. I use TLF reactors right now but I think I might switch over. They are $40 for one but discounted for multiples.
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