Hello- I know nothing about pools. We purchased a home with a four year old pebble tec pool that has a Hayward vacuum and sand filter. It is a regular chlorine pool. We have never experienced any problems until we purchased a new robot guy that travels around the pool. The new vacuum part worked great until we attached the new hose that came with the vacuum. The Hayward rep came to the house and he seems stumped. Apparently, they put some sort of UV coating on the newer hoses that is attracting tiny bubbles to it which, after time, makes the vacuum float above the bottom of the pool. We have always noticed that the pool is akin to champagne in that it seems almost aerated with little bubbles when agitated. Our chemicals always test normal, although, we are due to have the pool drained due to the hardness level. Does anyone have any other suggestions or has anyone else experienced this problem. Thanks.