Just got back from a weekend trip to find that my bottom drain is only putting out a miniscule amount of water. (pump was sucking air for who knows how long) It is quite a distance between my pond and the settling tank, any advice on how to unclog this beast? In the pond there is a diffuser that covers the bottom drain itself so I am assuming that I will have to come in from the other direction. I have used these pulsing type things that you shove down the drain when the shower is running slow, do they make something such as this for a 4 inch pipe?
Thanks,
Tim