spring opening the pond and main pump doesn't work! Off to Clarke Koi Ponds, we saw Randall (the owner and founder at the store) and for under $100 he cleaned and installed a new impeller saving us over $450 for a new pump! He also replaced the uv sterilizer bulb (our pond is pretty green with algae). I first met Randall at a trade show almost twenty years ago and he and Lauren always have the best advise and service!