Pond Boss Forums GENERAL QUESTIONS Help old neglected pond needs help

250' is no problem for an air line, just size it accordingly (bigger is better, with the most common air line being 1/2" i.d.)
The smaller the bubbles, the better that the aeration system works, (more water will be lifted and moved by smaller bubbles). There's an aeration sub-forum here, you will probably get more people that are aeration experts looking at it if you ask the aeration question again there.

It might help just running it during the coolest part of the day or night. Pond dye will help keep weeds from getting started if it's strong enough to keep the sunlight from getting to the weeds. The caveat of using dye is that it also limits the amount of photoplankton that can grow, which are the building blocks for life in a pond. We need to try and figure out what's causing the excessive weed growth. It could be from excess nutrients, excessive water clarity, etc. During the typical summer, how far can you see into the water?

Lily pads and cattails are some of the harder plants to eradicate, although it can be done with some work, and without having to spend a lot of $$.

Does this small pond have any water flowing into it, say from a pasture?