Hi i contacted gorgeous guineas about this and they send me copy of their newletter this is a quote from it
"During December we took some Equisorb for a test drive after poking, prodding and sniffing several different types of horse bedding at our local farm shop. Equisorb is a horse bedding based on Flax and is much finer / softer than Aubiose. It is very absorbent, dust-free, easy to spread and cheaper than Aubiose or MediBed. The best part is that it creates far less waste for recycling. For three large 6' Cavy Cages we normally fill 2.5 or 3 black sacks for each clean (plus another black bag for newspaper). Using Equisorb, this was down to just 1 black sack for recycling via a friend with an allotment
Because Equisorb is much finer than other beddings, it will compost down much more quickly, so there are lots of advantages with Equisorb. The guineas like it and have shown no signs of trying to eat it.
WARNING: There is another type of Flax bedding called Lincore available. This is NOT suitable for guinea pig bedding as it has been treated with Citronella Oil. It is made by the same company that produce Hemcore, and that too is treated with Citronella. So why aren't beddings treated with Essential Oils not suitable for guineas? For the simple reason that guineas are so low to the ground that they have their noses in the bedding all day long and their skin is in contact with the bedding too. Skin can become sensitised to the Oils when it is in constant contact and can cause intense irritation and swelling. Oils are inhaled and easily absorbed via the lungs. They are often very pungent and can cause sneezing, respiratory problems and can affect the internal organs causing a build up of toxins over time.
For some unknown reason, Lincore comes in an unmarked bag, so there is nothing to tell you what the product is or how it has been treated. One for Trading Standards perhaps?"
I would like to give it a try but not sure about buying 36 bales!!