Well, I thought this would be simple but I must be missing something. I'm trying to sanitize my freshwater tank by sucking a bleach water mixture into it. I have the city connection pugged, and a hose attached to the winterize fitting. I put the levers in winterize position as above. I turn on the water pump. the hose is submerged. I get no suction out of that scenario at all. At the moment, I can't figure out how to get this mixture into the tank. I even tried with the hose in the city/fill fitting, and the levers on tank fill and the water pump on, and get bubbles out. I'm at a loss and with a 10 gallon water/bleach mixture sitting here with nowhere to go. Any ideas?