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Wow! That is an incredible transformation! I had crystal clear water in my ponds for decades. Then most of my koi died and the ducks have been living in the ponds, pooping all over the place. My filter takes about 600 lbs of large grain roofing sand. I used to buy them in the 100 lb bags, but they became harder to handle as I got older. So, I have been using pea gravel in 50 lb bags. My water is green since my koi all died. One day I'll get motivated to get it nice and clear again.
What I do with the sand is use a stopper valve at the end of the hose. Open it up and use the pressure to break down the gravel clumps. With all the algae and the fish and duck crap, it gets nasty in the filter. I get into there up to my shoulders and it cleans out the gravel pretty good. Backwash and go through all the cycles before doing it again. That water is pretty black/brown coming out of the drain pipe.
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The fun - '06 Carrera, '79 930, '06 S4 Avant, '16 i8
The mundane - '24 Tesla Model 3, '22 Tesla Model Y, '19 Tacoma
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