We designed an affordable large hot tub with essential features that many customers love. This series offers the best quality at the lowest price. It has three modes: Standard, Economy, and Sleep. The sleek aluminum-plastic skirt adds a modern look. The dual-speed pump runs fast or slow, safe and comfortable for adults and kids. A 3KW thermostat heats water to a comfortable temperature in winter. It includes a filter and ozone sterilization for clean, safe water. The D series lets you enjoy a relaxing massage tub at minimal cost—perfect to unwind after work or share time with family and friends