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The pump will empty whatever silt it can suck up until the water level gets to the intake holes in the pump then you need to shut it off or the pump will burn out. What I did to clean out the silt was to use both my water hose running and my wet/dry vac to vacuum up any remains. I was much more efficient this time around as I only had to empty the wet/dry vac once (as opposed to 3 times the first time around).
As the water is being pumped out I periodically sprayed the slanted walls down to push the silt down to the lowest level then I vacuumed it completely out (kept the water running all the while). Next, I splashed the sides of the pool with about 2 cups of bleach and used a regular broom and a little more water running to "scrub" the sides down. Turned on the vacuum again and emptied the pool for the last time then started the long filling up process again. Since we have well water my DH has requested I not run it longer than 30 minutes at a time so I need to let it rest for 30 minutes in order for the well to fill up again. Needless to say that's a pain in the patootie and it takes a few hours to fill doing it this way but I don't want to spend $1200+ on a new well pump (been there, done that!)
I'm very pleased with the use of the wet dry vac and the pump together. It is much cheaper for me than my original plan to buy a pond vacuum for $400. I just couldn't justify spending that much $ for a pond vacuum which is why I kept researching... BTW, if you go the wet/dry vacuum route make sure to rinse it out very, very good before storing or it will be a mass of bacteria laden yuck! This time, I not only rinsed the reservoir out completely and the top part but I added two cups of bleach and filled it to the top with cold water then put the top part back in place to soak. I let it set like that for 20 minutes while I did the other clean up and then I dumped & rinsed it a final time. I checked it today and it doesn't stink at all!
(BTW this vacuum is now designated strictly for pool clean up. Gonna buy another one to clean out the basement as soon as they go on sale at Sears again!)
Yes, I do have the exit drain installed but I didn't cut the hole into the liner/underlayment at this time. I might not do it, I'm going to see how using the pump and vacuum together goes for awhile before I decide if I want to cut the hole in the liner/underlayment. At least it's in place if I ever decide to do it.
ETA: to answer your questions (I got a little carried away and just noticed I hadn't even answered you
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1) Right now I'm not running the pump except to empty the pool. I imagine by the end of this month it'll be cold enough to run it more often so the water doesn't freeze but I don't anticipate it running 24/7 for awhile. At least not until we are in the dead of winter or are going to have more than a few hours of freezing temps.
2) If I had to measure the silt I'd say it was probably about 3 cups worth.