I got that

But imagine the actual size of that pool in terms of how big the house is supposed to be and how many actual people would fit into a pool of 'realistic' size. Realism, or the lack of it, isnt really one of the big issues.
In my house there is only
one bathroom. The MC can spend 48 minutes there alone and several times that with one of the girls in nice discussion or with some perhaps even more pleasant action. The other folks might naturally be much, much faster with their baths & leaks, but even then then the bathroom could be a little bit inadequate for any larger household, I tend to think.
Luckily there is that huge yard with fx. a lush grove (that could actually turn into a
flush grove, who knows), big garden or even several that are mentioned to be equipped with
advanced irrigation - euphemism for heavy pissing, probably - a shrine offering nice hiding place for dropping... uh... a prayer or two. Stables are very popular among the girls. Perhaps because no-one wonders too much if there are some wet spots on the floor there. The horses must do what they need to do, we are aware of that - but even then there are not too many places where people can
wash themselves clean, I imagine.
Realism isn't big issue, I agree - but even some small issues might finally need a solution. Thus the pool could serve as a relatively nice thing for hygiene in the end, methinks. Ikaanians are told to be productive and smart. I find it possible that they could
take turns when they wash themselves in the pool OR showers in case there are such things available. Perhaps - just perhaps - it is not compulsory to jump in the pool everyone together.