If your going to go that way you should switch the hoses to avert bubbles gettin trapped in the top of the UV . I can’t tell if you have the UV in the water and if it is it’s not imo a very safe situation . Water and electricity with a piece of equipment that’s not designed to be submerged is a recipe for disaster. What happened to using the manifold system with the UV outside and above the sump . At this point to keep you from making , imo a possible dangerous situation I would suggest you to speak to someone near you that can assess your needs and guide you to a safe resolve . Do you have a lfs nearby ? Fellow experienced reefer ? Electricion ? Also you would benefit from possibly using a gfci and maybe a grounding probe for your safety. If you do In fact have that unit in the water that wasn’t from any help or suggestion from me . I would have never recommended hooking it up in the Water . It wouldn’t be safe .