If your looking to fill your hot tub with the cleanest water use a clean screen pre-filter. Freshwater Clean Screen Pre-filter helps to remove organic contaminants and metals, including iron and copper, from your water, before it’s introduced into your hot tub. This filter helps prevent your water from turning green from excessive metals in the water. Using a pre-filter is extremely important if you are filling your hot tub with well water.
Freshwater Clean Screen Pre-filter ensures the water is as clean as possible every time you fill your spa. Attach it to a garden hose to filter out debris and chemicals. This filter lasts for approximately 5 – 6 complete hot tub water changes or 5,000 gal.