Potti 內的魚菜共生生態系統，具備自我完備及水質自動淨化的功能，只要生態系統完全建立，便再不需要換水。換言之，在系統發展初期，用戶需好好控制餵食（一星期 2 次）及飼養魚類數量（首 2-3 ），生態系統便會很順利地建立。可是，一旦水變得異常混濁，魚類陸續死亡，便要立即把死魚取出，更換 1/3 水（換上已去氯或過濾後的水）及落半茶匙粗鹽在水中，一星期後再換 1/3 次，直至沒有魚死亡。Potti fish and vegetable symbiosis within the ecosystem, with self-purification and automatic water purification function, as long as the ecosystem is fully established, change of water is not necessary. In other words, in the early stages of system development, users had to take good control of feeding (twice a week) and the number of fish raised (first 2-3) and the ecosystem was well established.
However, once the water becomes abnormally turbid and the fish die one after another, remove the dead fish immediately and replace one third of the water with chlorinated or filtered water and half a teaspoon of coarse salt in water. After one week 1/3 times until no fish died.