I recently invested several hundred's of dollars in these nappies, not peapods but a bamboo/cotton, hemp/cotton nappies and they had two pages of instructions but not how to wash them, i.e gentle cycle and my nappies fell apart after three months. Thankfully the company replaced these nappies for me and updated there instruction manual.
I know how much these nappies can cost and it would be advisable to ring/email the company and find out first, I'm surprised they did not provide this information to you, check out their website. They are alot more delicate than what I thought.
Mine had to be line dryed after each wash to get the absorbancy. It is not advisable to soak these nappies or to use much detergent. It does take a while to wear in and they may wet through (babies clothes) several times before they become more absorbant but they'll get there.
When mine first starting coming apart at the seems I was washing them in warm water, intensive wash, and fast spin in a front loader, I now wash them in cold water, delicate cycle and medium spin. The bamboo was a more delicate material than the hemp product though. I hope this helps!