With one simple natural pre-filter, you can remove tons of problem contaminants from your tap water before it has a chance to cause problems for your spa. This simple versatile screw on garden hose filter catches dozens of contaminants that can cause real problems for your spa, hot tub, or pool down the line. Our garden hose filter uses a natural carbon charcoal and KDF based dual chamber system to get rid of contaminants like Lead, Iron, Chlorine, Pesticides, Mercury, Arsenic, Volatile Organic Compounds (VOCs), Copper, Chromium, and many others. Overtime many of these contaminants can damage your systems over time and cause early failure for other filters. So, we've created a simple inline filter to catch these problems early. All you have to do is screw this filter onto your spa's incoming water line and let it work its magic. It's good for up to 40,000 gallons of water and works with any standard hose line. Start using cleaning that protects you and your filters. This pre-filter increases your filter's functionality without altering the chemistry of your water. Get cleaner water the natural way. Also perfect for organic gardening, RVs, washing your car, filling fish tanks and ponds, watering your pets, horses, or livestock, or anything else when you need cleaner water from your garden hose.