H2o

[RichardHenshall]

1) disposal of water & 2) disposal of solids

1 = sewage (reasonably obvious link to water consumption there, even if pool/garden water doesn't become sewage!)
2 = domestic rubbish (more water consumed implies more people/activity and therefore more rubbish)

[joeysoap]

Thanks, Richard

always a fair system where user pays, so no actual invoice for rubbish bins which is good to hear.