fuzzface Posted May 21, 2008 Report Share Posted May 21, 2008 Hi I am going to make a sump for my 48x15x18, I was just going to use the spare 2 foot tank that I have. What size pipe should I use for the overflow? I went down to bunnings today and they have 15mm 20mm 25mm 40mm or bigger, I was thinking 20 or 25 but not sure. Link to comment Share on other sites More sharing options...
damo83 Posted May 21, 2008 Report Share Posted May 21, 2008 G'day, Have a look at this calculator: http://www.reefcentral.com/calc/drain.php I've just set up my 4x18x20 on a sump and i used 2x 1" (25mm) drains. The calculator said 1x 1" was enough for my flow rate but i went with 2 so if one gets blocked the other can still handle full flow. For the return I used 3/4" (19mm) as this fitted onto the outlet of my pump. Hope that helps at least a little. Cheers Damo Link to comment Share on other sites More sharing options...
Motorman Posted May 21, 2008 Report Share Posted May 21, 2008 If it was me I would go with 2 x 25mm pipes Though check out an irrigation shop before you spend your money at Bunnings and you should be surprised at the price difference Though I only have 1 pipe on my 4x2x2 and it works perfectly I would still go 2 if I did it all again Brad Link to comment Share on other sites More sharing options...
jimbozed Posted May 21, 2008 Report Share Posted May 21, 2008 i run two 25mm outlets on all my tanks, one draws water from the surface, one is extended to draw water from near the bottom. works well. Link to comment Share on other sites More sharing options...
fuzzface Posted May 21, 2008 Author Report Share Posted May 21, 2008 Thanks I think I will go with a single 25mm and see how it goes i'll check out a plumbing shop first though Link to comment Share on other sites More sharing options...
