We have the outlets from the tubes from the dosing pumps at the intake to the return pumps. At the moment we run a temporary aquarium with lots of holding tanks connected to the same sumps and fed by the same return pumps. This way all tanks gets some EasyBooster/SPS.
Worked well for about two years now. But of course we have to check the tubes now and then. Never had problems at the outlet, but a couple of times at the dosing pump and at the connection to the bag.
Whould you like to explain the reasons for that(tubes above the water). Thanks!