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  1. #1
    Member Rank = Tosai pfrosty's Avatar
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    3" bottom drain advice req'd

    Hi all looking for some advice from you koi pond building experts as I'm a complete novice and I'm now paying the price for a complety stupid mistake at the start of my build back in February
    I have spent the wholeday ripping out my 4" spindrifter and pipework from the concrete base of my pond due to it not been water tight. Back in February I used the incorrect solvent weld glue from b&q and somehow water was getting into the pipe. My best guess is that it was from the swept bend at the back of the pond under the wall where it comes up out the ground and into my garage. I presume it was rain water last night from the rain we had and the water worked it's way down the pipe and slowly filled up the bottom drain.

    So with the help of 2 family members and a still saw and concrete breaker we removed it from the pond base.
    Lots of blood sweat and tears involved.

    My question is can I replace the 4" spindrifter i had with a 3" version without any drawbacks or negatives?
    The positives are that it will be alot easier to replace in 3" especially where it goes under the wall at the back of the pond as this area is really tight to work in as my garage wall and pond wall are only 12" apart. I will then have to revert back to 4" pipe with a reducing socket 3" to 4" to connect onto my existing pipework which goes thru the garage wall into a slide valve and into a nexus inlet.
    Can anyone see forsee any probs doing this?
    3" bottom drain and pipe for first meter till it exits the ground then to 4" for about 2 metre to filter.

    To say I'm a broken man is an understatement but I will conquer this beast if it kills me ��

    Thanks again for your valued advice



  2. #2
    Member Rank = Tosai pfrosty's Avatar
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    Forgot to add it's a gravity BD and the pond size is approximately 1400 gallons
    Max flow rate will be 10k lph which is the max of the nexus
    Last edited by pfrosty; 03-06-2020 at 10:29 PM.

 

 

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