The Crypt

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looks like they used chain link fencing in the concrete as reinforcing wire/support?
That would make sense, but this chain link fencing was not embedded in the concrete, it was not even touching the concrete. My photo was maybe too close up without context of surroundings so it was probably not obvious to anybody. Sorry about that. Here are 2 pics at different angles. The chain link was hanging out on top of the plastic sheets, not touching the concrete at all.
Bottom layer: concrete (walls of the crypt)
2nd layer: 2 plastic sheets
3rd layer: bunched up chain link fence
4th layer: wire screen
5th layer pebbles
 

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Thanks, Addy1. I’m finally close to finishing the filter to that goes over the opening of the crypt and I’m almost ready to assemble the island above it.

It’s a pity it’s taken me so long to get to this point, but I’m going to go ahead and try planting bog plants and hope they survive the winter. I’ve got irises ready to go, but want to get a few more plants. Any suggestions? USDA Hardiness Zone 6.

Thanks!
 
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Red Cardinals bloom September/ December . pitcher plants have their color all but the end of winter
Rain/ fairy Lilly are one of my favorites. As is flags and forget me nots
 
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Thanks so much for those suggestions, JBBUD! I wasn’t familiar with rain lilies — those are really sweet and I’ll try to plant some in the spring. And although forget me nots are one of my favorite flowers, I had no idea they were bog dwellers!
 
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It looks to me like it was a filter. Pump underneath like you have it, some kind of support across the top, gravel over that. It would have pulled water down through the gravel. In principle a layer of chain link fence might have been part of the support but who knows. That seems like something that was improvised after the fact, maybe the original plan failed. Personally I would put a layer of medium or coarse Matala filter over your aluminum mesh. https://www.amazon.com/Sheets-Color-Matala-Filter-Media/dp/B005GXBWXU/ (Not the whole stack, that's just the first link I found.) If you're going to put gravel over it, you might also lay some kind of horizontal supports across the opening, otherwise I don't know how much weight the aluminum mesh will hold.

I like the island idea!
 
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It looks to me like it was a filter. Pump underneath like you have it, some kind of support across the top, gravel over that. It would have pulled water down through the gravel. In principle a layer of chain link fence might have been part of the support but who knows. That seems like something that was improvised after the fact, maybe the original plan failed. Personally I would put a layer of medium or coarse Matala filter over your aluminum mesh. https://www.amazon.com/Sheets-Color-Matala-Filter-Media/dp/B005GXBWXU/ (Not the whole stack, that's just the first link I found.) If you're going to put gravel over it, you might also lay some kind of horizontal supports across the opening, otherwise I don't know how much weight the aluminum mesh will hold.

I like the island idea!
That was my best guess too, so I set about getting the crypt to function as a big ol’ filter. I’ve been posting about my progress with that in separate post, “CRYPT FILTER; Advice on Support Mesh.”

There are some more peculiarities and mysteries that I’m discovering — I’ll continue sharing those in this thread once I have the time. I felt I needed to do everything I can to refill the pond before things freeze up in Salt Lake City. Luckily for me, we’ve had some pretty glorious fall days here, but it looks like that may change this week.

 

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