We mix our own mix instead of buying pre-mixed products. For our paphs we like to use the following mix:
Small coconut husks
Small redwood bark
and on some - crushed oyster shell
We always soak the coconut several times (remove salt) before using in the mix.
We find this works very well for us.
The Aussie Gold Mix was a big disappointment. It was mostly rock and was expensive to have delivered. I ended up dumping it into my flowerbed. lol.