Best sealant for filter and waterfall weir


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Hello everyone,
I’m new to the site but this isn’t my first pond .My question is what’s the best type of silicone or sealant to keep filter and waterfall from leaking and running behind the weir. I have had it running for a couple of days and am noticing that I’m losing water where the weir is connected to thetub,It could possibly be running under the lip on the weir and back down the filter ..I originally used 100% silicone caulk but the filter sat for about a8 months with no use so it’s possibe that the sun and elements could have made it lose its durability but I’m just curious if there’s a special sealant I should be using that would work better. Thanks in advance l
 

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Well it’s under the weir but not all the way up the filter to the weir like I should have done it
 
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So it’s running down the front of the tub and leaking out the side I’m thinking
 

Jhn

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Agree with Lisa, the liner needs to be clamped between the weir and side of the waterfall tub, that is where the silicone will seal it properly.

Also, if you let silicone sit out exposed to the sun and dry for a long period of time it can dry out.
 
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There’s really no way to get the liner pulled up between the weir and tub. The rocks in the waterfall have all been placed,foamed and caulked
 

Jhn

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How far up does the liner come? And was it left laying flat on the ground like you show it in the first pic?


The one thing I can think of that is simple is to take support board off from under the weir, add a piece of liner in there Silicone/ caulk the liner in between there then reattach the support board. Make sure the liner is long enough to keep water in the falls/stream bed then try and do a layer of rock over it to hide it. This should keep it from running behind your rocks.
 
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The liner comes about halfway up the tub,We put cinder blocks in front of the tub to give us a flat level area for building our rocks up in front of the tub and the liner sits on the cinder blocks ...Jhn if it comes down to it that might be what I have to do. Good suggestion,thanks
 
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Thanks GBBUDD, I’ll check that out as well..Earlier today while I was out I purchased a tube of this new gorilla heavy duty construction adhesive that says it works underwater and incredibly durable in all weather..The guy at the hardware store suggested it
 

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Thanks GBBUDD, I’ll check that out as well..Earlier today while I was out I purchased a tube of this new gorilla heavy duty construction adhesive that says it works underwater and incredibly durable in all weather..The guy at the hardware store suggested it
it's a polyurethane It is strong but i don't know about the toxicity of the product over time
 
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Okay do you know if you can buy that M1 stuff locally at like a hardware store or something or would I have to order it?
 
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a comercial roofing suplier but they probably wont seel to the general public you can order it online easy enough
 
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