I've managed to recycle about 15 kg of soap loaf ends and planer shavings within the last couple months. I found through experimentation that I can go half-and-half soap batter to recycled soap without having problems with bubbles or air pockets. Yesterday I used up the last 2 kg, mostly very brittle and dry old shavings from various soaps. I broke it all up with my hands before adding the soap batter. I scented it with NDA's Jasmine FO which probably smells nothing like jasmine but at least it behaves well in CP soap.