Look at the suction side of pump for a 'valve with hose'
That is the hose to use for sucking bleach solution up using the pump
*close suction valve from fresh water tank
Plumbing service compartment is the City Water / Fill Valve
Turn it to FILL. turn on pump and pump will discharge bleach solution into fresh water tank
Close 'Hose Valve'...open Fresh water tank valve
Connect water hose to city water connection and fill fresh water tank
Turn off when tank is full
Remove filter from filter canister....install bypass pipe if you have one....otherwise put empty canister back on for pumping bleach solution thru system
Turn pump on and pump bleach solution thru plumbing lines.....cold & HOT (thru WH Tank) to each faucet, shower, toilet, low point drains etc o bleach solution is in all plumbing lines
*no need to BYPASS the WH Tank
(Bypass when doing winterizing using anti-freeze....no anti-freeze into WH Tank, just drain it)
Bypass Valve is in outside compartment next to Water Heater
Leave bleach in lines for several hours....longer the better'
Then drain/flush/rinse fresh water tank
Turn pump on and flush/rinse cold/hot plumbing lines thru filter, all faucets, showers, toilet, low point drains etc
2014 Allegro Red Manual
If the above is too much...
Pour straight bleach into the end of your potable water hose (in quantity corresponding to fresh water tank capacity) then hook hose to city water connection, set Valve to FILL and turn water on filling tank.
Then use pump (valve set to city water) and pump fresh water tank bleach solution thru plumbing lines