its always advisable to use one yixing pot for one type of tea and not
brew many different types of teas in it. this is to ensure the purity
of the tea pot. a yixing tea pot will pick up the scent of the tea
brewed in it, e.g. tie guan yin, and over time, this will enhance the
flavour of the tieguanyin tea brewed in it.
using a pot for different types of teas will result in a mixture of
different scents and tea oils captured in the clay, affecting the
future brews.

regarding the qn abt pu-erh tea, i always found pu-erh tea cakes the
better tasting than loose leafs and tuo-chas. you might want to give
it a try.