That some here I can not confirm talk about mold. I make the remaining water as well as always after bathing from the octospiders out to prevent this in advance. Surely it is not hygienic, if you let the water in it and the parts are then not used for weeks. Since würd's not surprised.
To complain about, I then but also what. Since the toy beststeht of 10 parts, the risk is of course great that something disappears. So you fished 10 parts of the bath water, it must clean up and then needs to find a place to camp. This octospiders do not hold on the supplied disk and always tip over. Who has enough space for it is certainly not a problem. Annoys me somehow. 3 octospiders have been enough ?! And with the disk you can also not do much in a full bathtub.
Very nice pastime and a toy which has gone down well with our child. Also looks so cute! But honestly: Do you need something really ??? ; O)