Pumice versus perlite

[Lmpgs]

There is an orchid vendor in my country who sells this, another source is a Pet-Shop in my city and there can be found so called "Novasan", it is sold as substrate under cats ( heat treated neutral lava rock), it is same as akadama.

Thank you, I only find something similar

What do you think?

Once, I bought some phalaenopsis from an Ebayer (eco-sieben) and most plants were potted in a yellownish substrate, also I found the same at Popow's plants.

 

[dodidoki]

I know two types of pumice: yellow Kanuma ( a little acidic, pH5,5, my plants didn't like it at all) and Kanuma ( pH neutral). What I use is not yellow, light brown. My experience that bigger granulates work better ( d is cca 6-10 mm) than smaller ( 3-5 mm).

 

[dodidoki]

I show you this pic, you can see "my " Akadama.
https://imageshack.com/i/p8FCV4aLj