5(1)The authority may by order declare the expenses to be payable by weekly or other instalments within a period not exceeding 30 years, with interest at such reasonable rate as the authority may determine until the whole amount is paid.
(2)The order becomes operative, if no appeal is brought, on the expiry of 21 days from the date of service of the order and is final and conclusive as to matters which could have been raised on an appeal.
(3)The instalments and interest, or any part of them, may be recovered from any owner or occupier of the house and if recovered from an occupier may be deducted by him from the rent of the house.