My pool is roughly the same size for years we just throw a few scopes of chlorine in every week after cleaning and dump a bag of salt once a month not rocket science but it works
I had the run around for years in a chiayohum District Then we called Buriam and they explained all you need is a visa and passport and had my yellow book that day and the house book of were you live
Yellow book = pink card which equals more confusion because your name is printed in Thai and boarding cards in English. Just stick to your driving licence.