Two years ago purchased a home with a 20' x 40' inground vinyl liner pool and converted to saltwater. Basically I'm still "green" when it comes to pools. We manually cleaned for a while and finally decided enough was enough, so decided to purchase a robotic cleaner. I can't decide on best robotic cleaner for my application and would appreciate some advice. Most of the debris in the pool is pollen, and sand from filter. Occasionally we will get leaves and pine needles. This debris sticks along the sides and settles on the bottom of the pool. I have looked at the polaris 9400, aquabot t2, and the water tech blue diamond. I was all set on the polaris and then I read it was better for large debris? Thanks in advance for your input. Please let me know if I forgot any information.