There seems to be a Canadian geese plague in some parts of this country that has reaped havoc onto homes and business. I live near water and these animals come on the grass and eat it with the grass roots and replace it with tons of bird poop which is very unsanitary. There is so much of it at times you cannot even see the grass and the worst part of it is it has to be picked up by hand because the machines aerosolize the waste which is toxic. In the summer the geese go in my pool, drink the water, and poop large amounts into the pool water. When the pool is closed overnight they poop on the motorized cover and in the winter poop on the winter cover as well. Lately they do not migrate for the winter to the south nor do they migrate to northern Canada in the summer like in previous years. They reproduce in the river nearby and their numbers get larger each year as there is no predator to this species here. They don't like dogs but dogs will not chase them off the pool covers. There is a new bread of business in my area and online called geese chasers. Basically an expensive hired person who uses all kinds of things to chase or repel geese. The town environmental control controls them occasionally when their numbers get so high that they get sucked into the engines taking off in the local airport and endangering aviation. Golf courses in my region are loosing business because of unsanitary grass in the summer. The question I have is what type of spring loaded safety winter cover is so completely solid that it will not allow geese urine or rain soaked geese poop to drain into the pool. Many of the manufacturers are trying to reduce the weight of safety covers by placing a center drain or making a light weight "micro-pore solid" cover. Any porosity of a winter cover in this environment will change a winterized pool into a bird cesspool come spring time. So what is available in a truly solid, totally non-porous, safety winter cover or even non-safety completely non-porous standard winter cover? The recent trends in pool cover technology to make covers micro-porous to allow rain water thru but not light is not going to sell in this geese infested environment where the water on top of the cover is unsanitary waste water instead of clean rain water..