Wednesday, July 9, 2008

Building a Fish Pond and Waterfall - Part 2

Part 1 | Part 2 | Part 3

Part 2

Step 7

Lining the interior surface
of the Pond with rubber coating

I started by etching with Concrete etcher and then sealing the interior walls of the pond with Perma-Flex. Used a gallon of concrete etcher to clean the concrete and open the pores for absorption. I washed out the residues and sponged the rest out, then I waited a day for the rest to dry, then used a leaf blower to blow the dust accumulated in the empty pond.

Then I applied PermaFlex to the interior surface to waterproof the pond (Pale yellow color). Perma-Flex is actually a Rubber coating that when sprayed (or in this case rolled) onto a porous or concrete surface, actually permeates into the concrete and fills up all the microscopic and larger pores, thereby forming a waterproof barrier. It is non-toxic and forms a rubberlike layer over the concrete that is unaffected even by hydrostatic pressure.

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Step 8
The Filtration system assembly

Laying down Weedpaper before starting the Filtration system assembly.

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Step 9
Fastening the Pump
and UV Clarifier to Treated Wood bases

I fastened the Pump and the Ultraviolet Clarifier to treated wood bases so I can anchor them. Had to drill four 1/2 inch holes in each.

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Then I laid the pump and UV Clarifier down and anchored them with 1 foot metal stakes.

Step 10
The Ultraviolet Clarifier UV Tube

I inserted the 36Watt Ultraviolet Bulb into the UV Clarifier housing (very gingerly). I was reminded of the helix shaped tubes from the movie Resident Evil in which the virus was contained before they broke and all hell was set loose.. :)

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Step 11
Connecting it all up

Then I connected the UV Clarifier output to the Waterfall Weir. Bonded all the PVC fittings tight with PVC cement. The Waterfall Weir/Biofilter is raised to 1 foot above the planned pond water level. That should be enough for gravity to do it's thing. It is beginning to come together.

Step 12
Laying down the PVC Liner

The next big job was unfurling and laying down the PVC pond liner.
It smelled pleasantly of hot rubber, not surprisingly considering that it was about 94 degrees F outside when I was doing this.

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One end of the PVC liner needs to be fastened to the lip of the Waterfall Weir using about 16 screws and the lip fastener.

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The liner now needs to be nipped and tucked and folded into all corners and crevasses and form fitted by hand to create a free flow passageway from the lip of the Waterfall weir to the Pond. I do this using the cinder blocks underneath for support, as well as small boulders and moss rocks along the periphery to build the side walls and structure. I use flagstones underneath to give it a flat and smooth surface.

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Step 13
Form fitting the liner to the waterfall
with flagstones and river rock.

Next, I use egg shaped smooth river rocks and flagstone to create a descending terraced spillway from the Weir Lip all the way to the Pond and then 6 inches under the planned water level.

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There ! :-)
Next I will have to use all the remaining River rocks to cover the black liner from all sides and also shore up the sides of the waterfall and backfill the rear of the Waterfall Weir.

More coming up in Part 3 !!

Part 1 | Part 2 | Part 3


  1. What the reason to use Perma-Flex? I have one pond made by concrete and it is now leaking. Should I use Perma-Flex to seal it. do you have recommendation?

  2. Permaflex is fantastic... I swear by it... Use atleast 2 coats. The first coat will permeate into the concrete, sealing all the pores, it even goes into the concrete about an inch to seal properly... Then put the second layer on, it will be nice and smooth.

    Let the first layer dry first..
    good luck

  3. Thanks for the comment. Can I finish 1 coats and leave it for few months or a year? I am planning not to put water until late winter or wait until my koi fish grow bigger. Should I fix it first or wait until next year? If I fix it, can I leave the pond dry (without any water)? Until the fish grow bigger and I will put them in the pond.

    Do you use Permaflex and LRB (Liquid Rubber Base) ?

    Is this a right product to use?

    This products are quite expensive. Do you know other places to buy from?

    - Steven


  4. how to fish ponds

    This is the first time I’ve read about this. I keep learning new things everyday!

  5. Hey Starter,
    Yeah, I guess you can use both, follow the instructions on their website.. I left mine for about 1 month before I filled it. The sun , if very hot, might make it blister though... but that might also happen if it didn't bond with the cement properly, or if there was an air bubble trapped..

  6. Lovely post. To have pond means to add beauty in our life Pond Pro 2000 keep pond harm free and sustain its charm without harming fish. .

  7. Informative post and I like it. If you are worried about water life in your pond, the Pond Liner Repair Kit is here to help you and secure the pond without harming the plants and fish.