Leaky Pond


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We have a pond in our garden built by the previous owners. It has a strong plastic liner built within a brick frame. After many years, the pond is leaking considerably but we can't find the leak. We've turned off the pumps, cleaned all the filters and the water levels have continued to reduce. We've allowed the pond to empty (moving the fish) but still can't find the escape route. It needs gallons of water daily to top up the levels. Is there anything we can try ie. bentonite (will this work on this style of pond) or relining or something else? Thanks.
 
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j.w

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@STARFISH
Have you tried to fill up your pond and just let it leak out till it reaches the level where it stops? If you can do that you will know that the leak is right at that level and can search ever so careful around that stop line. Turn off and waterfalls, pump etc. If it empties completely than it will be a leak on the very bottom. Perhaps you have already done this if so then what were the results?
 

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Agree with @j.w, Also, pics would help us see what is going on, to see if it is worth patching or just getting a new liner.
 
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Thanks for replying. The water level is almost at the base after leaking for the last 2.5 days. We believe the base is causing the problem given the level it's at now so we're going to re-line it and hope for the best!
 
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It's not plastic based. It's a rectangular, raised from the ground, brick built pond with the liner inserted. I can send images but not sure how to using this forum.
 
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j.w

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A new liner would be just the right thing to do! Just make sure there are no sharp edges or pokey things to puncture your new liner. I'd put in some padding first. Old blankets, carpet etc. to protect it. Some just keep the old holy liner in there and put holes in it and then the new liner over that. The holes are so no water can settle between them and make big bubble up (hippo's they call them) which could cause your new liner to float upwards.
 
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It would appear someone loved this pond and spent many a hour getting the liner just so i don't see one wrinkle and that is a challenge in it's own right. But like @j.w said placing a new liner over this one is an option but where they did such a nice job with the liner i would find the hole. Cleaning the rubber thoroughly can help to show the pin hole if that's the case. Like was mentioned fill up the pond and everyday record how much the water drops. when it stops that is where the leak is. If you look at the results and every day for 3 days has 2 inch drop but 3 days later it drops only one inch per day would say the water dropped past one leak and is lowering to the next.
 
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It's not plastic based. It's a rectangular, raised from the ground, brick built pond with the liner inserted. I can send images but not sure how to using this forum.
Oh, you said it was a "strong plastic" in your original post, so I thought it was a preform.

Yep, I agree with what's been said. If you can't patch the old liner, poke holes in it, lay some type of underlayment and then lay in your new EPDM liner.
 
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OK great thanks. Sorry I mislead in my explanation. Would we need to apply some sort of adhesive to hold the liner in place?
 
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OK great thanks. Sorry I mislead in my explanation. Would we need to apply some sort of adhesive to hold the liner in place?
Is the material stretchy? or does it seem not so much . if flexible there are repair kits for epdm liner. some have even used s30 by locktite and just caulked the hole
 
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We haven't yet bought the replacement liner. We're thinking of placing a new liner over the top of the existing rubber one as we can't find a hole, so hoping that a new liner over the top of the current one would seal it. Therefore we wondered if it need some form of adhesive to hold it in place?
 
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The new liner will be a bit of a challenge to make as nice as is the one you have now, but a few wrinkles will disappear as the algae grows. the other challenge is to cut out the old mortar or caulking on the vertical wall and lifting the cap
 
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addy1

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Welcome to the forum!

That is a nice pond! Good luck with the fix. They do make kits for repairing liner. But you need to know where it is leaking which may be difficult.
 
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I appreciate your welcome comments. That's part of the pond. The second part of the pond runs at a lower level l-shaped but runs completely separate to the higher level pond. I'll post a picture in daylight!! We inherited the two ponds when we moved in almost 20 years ago and still have some of the original fish! It's such a shame we're struggling to detect the leak and hope the replacement liner solves the problem. I'll keep you posted!
 
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Yay, the new liner is in and water level barely moved overnight. Fish appear happy so all good. Appreciate all your help and suggestions. My husband believes it was the seam on the previous liner that had become weak on the base. The new liner comes with a 25 year guarantee so if that's the case, the previous liner is possibly that age.
 
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