how would i fit a drain in a pond liner please?and how would i get water to filter as pond would be 4 ft deep and filter is only 800mm high?as wanted wtaer level in filter to be same at top as pond in case of pump/power faliure
cheers
given up on wooden frame now going for blocks

You can't mate.

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King of the Datnoids

I think it is possable ,
you would need some kind of sillicon glue or a bottom drain with gasgit with a flange.Great care would need to be taken in order to geth the drain in the right place,at it would need to be well supported or even constructed from some blocks.( not sure how you would go about this?

pipework would need to be used to form a U bend and take this up higher to the filter.
One question is what filter are you planning? gravity fed or pumped presurised?

i will leave the exact details to the pond experts ,but im sure it is possable.


found this for you sumo
http://www.koicymru.co.uk/constructb3.htm

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yes ya can

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WHO'S YA DADDY

i really don't think it will work.

i'd be interested to see it work, but i really don't think it can.

i'm not saying it's impossible, but i can't see it happening.

why do you want a drain? is it just for water changes? if yeah.. i'd say forget the drain and buy yourself a powerful return pump off ebay for 20 quid and whenever u wanna do a water change. Just rig it up with a bit of pipe work and then just drop your return pump into the pond and siphon out water that way. thats what i do and it works a treat.

cutting holes in pond liner is just asking for trouble in my opinion.

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King of the Datnoids

I think you will find peter that sumo os making a large koi pond. the (drain) is piped and pumped into the filter.it means you have a perfect clear bottom to your pond.and we all know how much mess big koi make.

if i were building a pond i would find away to get a drain in the bottom for sure!

there are websites like i posted in my earlyer reply. it would need to be sealed well for sure!

Sumo if in doubt ask at your local koi dealer as they will use them in their holding tanks/vats

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my first pond had a bottom drain and it worked a treat. i'm all for them, but if i were gonna go that route i'd be looking to do it in concrete.

my current pond is a pond liner jobby but with a powerful filtration setup. it still drains from the bottom but has pipework going from the outside and down to the bottom.

if it can be done with pond liner i wanna see it, cos that would be cool banana's!

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King of the Datnoids

Pete, I take it you weren't in the Royal engineers then

You can retro fit drains but much easier to fit them when starting to build a pond.

They can be 'purge to waste' drains, gravity fed filter systems, loads of type, usually running straight to a vortex chamber for getting rid of suspended waste. It makes pond keeping maintenance a doddle, open a valve and flush to a storm drain.

Most common bottom drain size is 8" with a 4" outlet, there are smaller ones, I think you will need the 2" outlet to attach pipes to the filter. Not sure what filter you have, if there are no suitable connections on the filter then a tank connector will be needed.

Drains have two flanges, usually self tapping screws for tightening/clamping the flanges, chuck the self tappers away drill 6mm holes through the existing pilot holes and get some M6 stainless steel machined screws of suitable length, with nuts on the dry side under the liner.

You can use silicone as a self-forming seal/gasket, this is only a seal, not an adhesive, it doesn't bond to the liner or plastic. I used insertion rubber sheeting and cut the gasket to the same size as the flange.

You can even use off-cuts of liner cut to the size of the flange, even cork. Essentially a gasket is just a 'packer' that removes any discrepencies between two mating surfaces.

Standard grey domestic waste piping and brown terrestrial piping usually 150mm and 4" can be fitted to the bottom drains. You dont need to stick to the dark grey pressure pipe. Plus its too expensive.

Sumo - I'm not sure what you mean by the filter level, you can use standpipes to control the level.
Google some of the koi clubs for their filter design, loads of systems for the DIY filter

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Keep fish......... it's cheaper than therapy!

One life, live it, love it

hehe Dr i'm about as technical as a ball of string.

i'm always interested to learn though

good info provided, i'm sure it'll be great use to sumo.

mr.sumo when you read this, if you do start this project, you should take pics from start to finish so we can all learn.

would be great to see mate

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King of the Datnoids

what about box welded liners are they any good?i can get a second hand one large a good price what do i need to look out for please?
will take pics as i do pond hopefully