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you might as carl about that. I have not read anything from Momotaro that specifies stainless must be used. I think the main reason is the durability and the aesthetic appearance. It also has the specified and tested best dimensions etc etc
If it sits in the open Stainless looks much better. There may be other reasons but I haven't studied them. Plastic will work too as far as I know. You just want to be sure you get the same dimensions, distance between layers, depth of layers, flow rates, and even distribution. With shorter plastic crates it does affect the flow. How much that affects performance is unclear to me at this point. In general, I think a more even flow is always better.
I have a pond with BH and crates running fine. One with stainless is just starting to run. I will let you know if I observe any significant differences. One though would be the adhesion of different bacteria strains, and another would be the temperature and the hardness factor affecting oxygenation and possibly any electrical dimensions. Good question for Maeda.
Might you know more about that subject tewa?
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