I have been using this for years and will continue to use in both the house and caravan. After heavy rain and flooding a few years back the house ended up covered in mould. Since using these crystals in wardrobes, bedrooms and storage areas we have had no problems with mould in this humid climate. Just recently, I forgot to put a container of green goo back in the caravan after a trip. Surely enough we have just used the van and noticed mold on the canvas and top cupboards. That is what lead me to finally writing a review. This stuff definitely keeps mould under control and saves me soooo much time.