This note was sent in from Graham, one of our KON-TIKI-TAS Deep Cone Kiln customers:

We bought our Terra Preta Deep Cone kiln with a heat shield nearly 4 years ago. We have since made a lot of high quality biochar. We have also appreciated how Frank remains interested in his clients and an ongoing source of useful advice.

The photos show our kiln, the tanks we use to store quench water (before and after) and our store of material that will become biochar in future.