Scott & Andrew on Instagram: "Question: How is the natural pool filtered? Answer: With plants and a simple-to-build bubble pump system 🫧 The bubble pump works by creating a gentle current within the natural pool, drawing water through the regeneration zone, consisting of a gravel bed with aquatic plants, geotextile membrane and loops of perforated land drain connected to vertical pipes in each corner of the swim zone. We installed an air compressor attached to tubing forming a closed loop aroun