Our previous camping trips have been at sites with full hookups so I hadn't bothered with the water holding tank or pump until recently since our latest trip was at a site with no hookups. In preparation for this trip I went through the manufacturer recommended process for sanitizing the water tank, water heater, and pump in my StarCraft 13RT and while I'm pretty sure the tank itself is clean, there's still a problem with the pump and I'm not sure how to deal with it. For reference, I filled the water tank, added bleach, let it sit for a couple of hours, then drained all of the water out of the tank, and refilled and drained it a couple of times with fresh water to rinse it out. When draining the tank, I opened the drain valve at the bottom of the tank and also ran the water pump and pushed bleach water through the pump and the faucet and out the gray water drain at the same time. I'm not sure exactly how much of the water went through the faucet and how much went out the bottom since I just let the gray water drain through a hose into the gravel where the trailer was sitting instead of into the gray water holding tank. However, it was probably at least half of the 35 gallon capacity of the tank. Unfortunately, once we got to the campsite and I started actually using the water tank/pump, I discovered quite a few brown algae (or mold?) "floaters" in the water coming out of the sink faucet. This does not happen when using shore water directly from a tap. I held a pan under the tank drain valve at the bottom of the trailer and didn't get any floaters there so I'm fairly certain that the water pump (or its hoses) is the source. Because of this we ended up not using the water tank for cooking/drinking at all and I made an emergency run to the nearest town to get a bunch of bottled water. So, my question is if there is anything I can do to properly clean out the water pump so it can be safely used, or am I looking at replacing the pump? I don't really want to go through the bleach process in the holding tank again since the tank itself seems to be fine, so I'm thinking about possibly filling a big container with more concentrated bleach water and using the bypass valve on the pump (used for pumping in antifreeze when winterizing the trailer) and giving the pump itself a heavier bleach treatment, but I'm not sure if that's a good idea or if there is something else I should try. If it is OK to do that, should I just let the bleach sit inside the pump for a while to kill anything left in there before I try to thoroughly rinse it out again? Any other suggestions? p.s. The pump is quite loud while it is running, and actually vibrates the whole trailer a bit when it is cycling. I'm wondering if that is normal or if it indicates a more serious problem inside the pump?