I stand to be corrected as this is just my interpretation of the condominium law:
I would have thought that the pool falls into the category of "common premises", and as such Article 16 would apply:
ARTICLE 16. – Condominium owners become owners of all the common premises of the main property, in proportion to their building plot share, according to the provisions ruling coownership.
Condominium owners have the right to use the common premises. The extent of this right in such places as common coal cellars, garage, terrace, laundry and drying rooms shall be proportionate to the building plot share, subject to anything contrary in the agreement.
The running costs of the "common premises" are also laid out:
ARTICLE 20.- Each of the condominium owners are liable to participate the followings unless otherwise is agreed between themselves:
a) Equally to the expenses of door-keeper, central heating operator, gardener and watchman and the advances to be collected for them;
b) The insurance premiums of the main property and the maintenance, protection, amplification and repair expenses of all common premises, in other expenses such as the salary of the manager and in the operating expenses of the common installations and the advance payment for expenses, in proportion to its share of the building plot (1).
c) Condominium owners may not refrain from paying his share of expenses and advance payments by desisting from his right to use the common premises or installations or that he does not need to benefit from the same because of the situation of his independent division.
Pretty much says everyone has to pay their share for the running and upkeep of "common premises", with no distinction made between those who live their all year round or rent their property out. The only way they could make it legal is if its entered into the Management Plan, and that would require the usual majority to agree.
This is all on the basis that the pool is classified as "common premises". We don't have one on our sitesi so never really thought about it.
But, as usual I will say, don't believe everything you read on the internet and take advice from a professional.
JF