In such circumstances, provision should be made for discharge to a properly constructed and maintained sewage treatment facility, either a sewage treatment plant or a septic tank.
Mewn amgylchiadau o’r fath, dylid darparu ar gyfer gollwng i gyfleuster trin carthion sydd wedi’i adeiladu a’i gynnal a’i gadw’n briodol, naill ai gwaith trin carthion neu danc carthion.