Simply Koi and More Koi

hi all am nearly finished with new pond just a quick question,is there an ideal distance to set the dome of a spindrifter to the base of the floor ie the gap where the water will go into the sump i was thinking around 3/4 of an inch

Hi hoofman,

It depends if you have any small fish that can get under the drain as they may chase food down the drain but normally as long as you can get your fingers under it should be OK.

Also important how much water you will be drawing through the drain.

As far as fish getting into the drain, I have two sunfish in the pond I keep for old times sake as these fellows are almost 14 years old, being perch shaped they actually lay on their sides and swim into the under the cover and into the bottom drain and later come out the same way. Never found one in the vortex yet!

B.Scott

there are 2 bottom drains pond volume will be 7,700 gallons fed into 2 nexus 300 both with sequence 10,000 pumps

In that case I wouldn't make the gap too small. I'd make it about an inch if it was up to me. You are running ant about the maximum that I would consider pulling through a bottom drain.

B.Scott

Hi there,

Not sure if I am missing something here, presume you are using 4" pipework?

Sequence 10,000 on a 4" bottom drain, no problem whatsoever gap around 15mm will be easily enough, fingers width. I happily pull through with an Aquamx 16000.

If you have too big a gap then you will reduce the draw of the drain.

Think I did the maths sometime and 10mm gap around the diameter of the drain cover is more than the surface area of the pipe.

Regards

Dave

yes its 4 inch pipework have gone for 20mm gap thanks to all for advice will post pics soon

As a rule of thumb I normaly go with 2 fingers width.

Jules

Nice one Jules, Low tech easy answer!

Hoofman,

Please can you post piccies of your Nexus set ups during build along with pond piccies

I'll defer from cracking any finger jokes.

TicToc

will do tictoc hopefully will be doing it at weekend if its not bloody raining,the two finger jokes could be endless lol