We have (I assume) a perforated drain pipe buried in our walkup basement area (unfondly called "the pit" - that's subject of another rant about this house). The pipe drains into a sump pump hole in the machine room of the basement. The pump then sends the water out onto the side yard. For years the water draining into the sump has been mostly clear & free of sand. Lately the sump pit has had sand in it after it gets filled from a good size rain. I assume the sand is coming from the trench that the drain pipe is buried in. Is the sand coming into the pit an indication of another, possibly future, problem that we'll have to deal with, or should we just forget about it? e.g. retrenching the pit and laying a new drain pipe. The new behavior of sand coming in has me curious.

[b][color=#000000]We have a septic system consisting of 4 septic tanks, 1 pump chamber, a sand field, and a leach field. The system is 4 years old. It uses a 3 float system (I think) to enable pumping, and a set of timers to trigger the pumping for the pump chamber and sand field.[/color][/b] [b][color=#000000]The pump chamber seems to not pump itself when the floats are high enough (the timer has power and the “OFF” indicator light is lit). If I set the timer’s off period to something very short, I can watch the timer click to “ON” very briefly, then flip right back to “OFF”, even though the on duration is set to much longer. However, flipping the pump switch to manual-mode instead of timer-mode will make the pump chamber pump work, so I don’t think it’s the pump at fault. Here’s a [url=https://photos.app.goo.gl/WBUfLFf5LtYsnSEC9]video[/url] of it in action.[/color][/b] [b][color=#000000]Is this a busted timer, or is something else going on that I’m not aware of? Thanks for any advice![/color][/b]