I HAVE A LITTLE REBUTTAL FOR THE RAINBOWS AND HOW WATER CANNOT BE USED AS AN EFFICIENT FILTER. HAVE YOU EVER PASSED GAS IN THE BATHTUB? DID IT FILTER IT? NO! IT JUST MADE IT WORSE. HOW BOUT IN THE GOOD OL COLLEGE DAYS DID YOU EVER SMOKE ANYTHING THROUGH WATER? DID IT FILTER IT? NO! NOW THINK ABOUT THIS. THE RAINBOW CLAIMS THEY MAINTAIN AIRFLOW DURING USE. HOGWASH!!! THINK ABOUT THIS, WHEN YOU DRINK A SPRITE WHAT HAPPENS YOU CAN DRINK IT PRETTY EASILY, CORRECT WELL WHAT ABOUT A MILKSHAKE LITTLE BIT OF DIFFERENCE THERE WOULDN'T YOU AGREE. THAT IS WHAT HAPPENS WHEN DIRT GETS IN THE BASIN OF THE SLUDGE PUMP(RAINBOW)!!!!!!!!!!!! I THINK ANYBODY WITH A LITTLE BIT OF COMMON SENSE SHOULD BE ABLE TO REALIZE THAT. NOW ONE LAST REBUTTAL THINK ABOUT WHAT HAPPENS WHEN AIR IS SENT THROUGH WATER BUBBLES AND WHAT HAPPENS WHEN THE BUBBLES GET BIG THEY POP AND THEN BAM! DIRT IS ESCAPING RIGHT BACK IN THE AIR THAT THEY ARE CLAIMING THEY ARE CLEANING. HONESTLY PEOPLE THINK ABOUT IT STOP BEING FOOLED BY THE PROPAGANDA