Cob: Cob Swimming Pool & Bathtub??

[Paula Moss]

Hello everyone!

My hubby & I will be building a mud brick house within a year. We just got
the land, well almost, still have to sign the contract. We live in Sydney,
Australia & the land is in Cowra.

My question is: Is it possible to make a swimming pool & bathtub out of cob
or clay?
I know we would have to seal them very well. But, with what?  I have tried
to look on the net for some info, but have found
nothing. What do you guys think?

Thanks!
Paula