Ok here it goes. Opinions on Pond Vacs...Beneficial or a waste of money? If a pond vac is used on a routine basis can that take the place of a complete pond clean out with water change in the spring? I saw a Pondovac 4 with good reviews but want to get some opinions on here. I never fully trust reviews online as some companies can pay a service to post positive reviews about their products....Getting opinions on here is always entertaining but honestly would like to know what people think. Before I go and spend $350 on something that isn't going to work as well as a complete water change in the spring id like to hear what people have to say...Also some opinions on here is to keep a certain amount of algae on the bottom of the pond. Will the continuous removal of algae and matter by the vac affect the ecosystem and throw off the ponds natural balance?