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Pumping down to check for sludge behind rock filter (North side) 18 in. to 24
in. found
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Pumping sludge from behind rock filter (South side)
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Washing rock from around the outflow area to remove sludge. Washed from North
to South
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Preparing to drill a hole.
*Had to level top of filter before drilling
any holes.
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Holes drilled apx. 10 ft. deep through middle section
Outer ends were
apx. 5 ft. deep
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Removing drill bit to put 6 in. plastic pipe into hole
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Pump used to pressurize drill bit, & pressurize pipes for cleaning filter.
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Injecting water into pipe after pulling out of pipe w/ a 6 in. trash pump.
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Checking flow through rock filter while pumping out & injecting into pipe.
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Checking water flow through rock filter while pumping out w/ 6 in.
& 8 in. trash pump.
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Injecting into one of the pipes & watching the water come through the filter while
being pumped down.
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More of the same.
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Cerro Gordo, Il. 2008
Cerro Gordo's filter wasn't getting the desired flow, so we did some brain storming & came up
with a new game plan. This time we used a mini excavator to stir the rock while pumping water out of the out-fall area. This
process was very effective, because as we discovered algae & sludge had built up in the 1st 3 to 4ft of both outside edges
of the filter. By digging up the rock it stirred up that algae & sludge & allowed it to move to the outflow where
we pumped it to the secondary cell.
