Can't you insert normal frames in the flow hive? I hate plastic, it breaks all the time and there is no nail repairing it.
On the the flow-hive web site www.honeyflow.com/,there is a forum that discusses the hives and beekeeping. Like permies,com, all
you have to do to participate is sign up to be a member. Any questions about the durability of the flow modules can be answered ;
there.
There is a choice of what to buy....a complete flow hive....or just the flow modules. The flow modules were designed to fit inside standard
Langstroth supers. There is a downloadable instruction manual in PDF format that shows how to modify Langstroth supers for both
partial and full use of modules in a super. They have 3- and 6-frame flow modules for the 8-frame super and 4- and 7-frame flow
modules for the 10-frame super