Most of the season I've been going to TSC get my pellets for my stove. But this last load I went to Lowes to pickup an order. So being there I decided to grab a load of pellets from there. They had the Green Team and Inferno Gold. I like burning soft wood if I can fined it. So I brought home a bunch and started to burn them. I clean out my stove once a week if it needs it or not.I run an Englander 25 PDVC so scooping out the burn pot daily is a normal. Today I shut the stove down and started to vacuum the stove out. The hose kept getting clogged with hard lumps. After several attempts and having to take the hose off to get the clog out. I put my hand in and started pulling large lumps of what appeared to be molten sand. The lumps are so hard you can not break them with a single hand. I've been burning for over 10 years and have never run into anything like this before. A lot of times I get heavy ash but you can vacuum that up. This stuff you can not.