Tap water vs rain water

What is the cleanest?Answer Below - In the video I am armed with a PPM (parts per million) meter to measure the TDS (Total Dissolved Solids) in; 1. Harvested Rain Water 2. Filtered Rain Water 3. Pond 1 - Relatively clean, unfiltered, oxygenated with few leaves (from local trees) 4. Pond 2 - Relatively clean, unfiltered with many leaves from local trees (leaves make a tea) 5. Tap Water Harvested Unfiltered Rain Water = 027 PPM Filtered Rain Water = 015 PPM Pond 1 = 116 PPM Pond 2 = 168 PPM Tap Water = 304 - 312 PPM