DBK
LIFE MEMBER
The problem with emptying the tank and opening the taps is there will still be some water in the pipes which won't drain away or evaporate. This is the water which allows the algae to grow.Thanks I might try that. I always drain it all down after a trip and leave taps and tank open to dry. I put Aquasol in the tank for 24 hours before a trip and then change the water. There aren’t usually any problems.
What I do is put some water purification tablets in the tank on returning then run the taps until the treated water comes through - you can smell and taste it when it does. Then leave it for 24 hours, run the taps again to flush out any bits and drain down.