We haven't used our autofill valve since we have been investigating a possible leak. We have fixed the the leak and now want to use the autofill while on a trip. We opened the lid to the valve cavity and were surprised by the nastiness of the water. We drained the cavity and noted the clay like substance on the bottom of cavity. When the valve is operational, the water that enters the pool is not clear but very cloudy and full of white particles. Is this normal? What is the substance at the bottom? Could it be diatomaceous earth? We've got a call into the pool builder but thought we would try here too. Thanks.