Tomorrow I will do my first tests with my kit. A clarification please. It talks about viewing the test water as it turns from pink to clear. The front of the test tube is somewhat frosted, but the back has little Windows that are clear. Am I correct that I view the solution thru the little clear Windows while swirling and using the drops to turn the water to clear, or do I view the solution from the front thru the frosted part of the tub. The instructions don't tell which way. Thank you, John