For the FW tank you have to but the mix in the fresh water intake on the outside of the unit. If you have a outside shower take the shower head off and put that in the FW intake (then you can use the pump). When you turn the pump on then you have to open a tap in order to get the liquid moving. Once there is pressure built the pump will shut off.
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ALJO 'Forever Young @ Heart' provide on their travels Music Entertainment to Senior Care Homes