Which perforated pipe for drainage field?

[mikethepipe]

The drainage field needs replacing on my septic tank,it wasn't correctly sized or installed when first commissioned-there are many of these systems localy,and they all seem to use the flexible land drain which is specifically mentioned as being unsuitable in Klargester's literature-what is the position,the BCO doesn't see to mind using land drain-are there any dsadvantages i should be aware of?

 

[Deluks]

I think you need to contact klargester for the low-down.
It might just be cause they want you to use their own specified products. Like when printer manufacturers recommend that you only use their own 'genuine' ink. (in other words, BS)

 

[ajstoneservices]

I've used the 4" before with a fleece type wrap covering it but the silt fines here soon clogged that up. To be honest the best way is to use the un-wrapped pipe buried in straw i've never had a problem when using it.

 

[mikethepipe]

thanks deluks and ajs-bit more research needed-must say i've not heard of the straw thing-my understanding is 300mm of 20-50 stone below pipe and 50mm above then geotextile then normal backfill.

 

[Nige F]

the internal silt will lay in the concertina grooves if you use slotted u/ground plastic, it won`t

 

[mikethepipe]

thanks Nige-so i guess the silt sits in the concertina bits,this then blocks the drainage holes,I was thinking about getting some plain pipe and drilling a load of holes as the proper perforated pipe is v.expensive.

 

[Nige F]

sounds like the ideal answer

 

[Deluks]

Use a grinder or recip saw and cut slits along it's length.

 

[Hugh Jaleak]

I'd look for a few suppliers online, IIRC the perforated 110mm pipe isnt vastly more expensive. I'd be happy to pay the slight extra than be drilling a few hundred holes...

 

[mikethepipe]

looks like the perforated pipe is twice the price of the plain-say an extra £15 every 6 metres-and i need quite a bit of pipe,so looks like angle grinder here i come!Thanks for the advice.