Aquarium water is potable (drinkable)—very different environment than a swimming pool. Saltwater aquariums Will also require different sensors. And as we mentioned in the other thread, swimming pools have a particular issue because the chemicals are usually dumped in all at once and then allowed to disperse, so you get an inrush overload, including the chlorine.
In these kinds of situations, the small details matter, so it is best to follow the manufacturer’s directions for any specific Sensor model. Or write and ask them if it can function in your specific environment.
There are definitely some continuously monitoring pH sensors designed for use in aquariums, but again the user manual will tell you if it could also be used in other kinds of liquids, including swimming pool water.