Bernoulli Standpipe
- 1" slip to 3/4" male pipe thread (MPT) adapter - $0.77
- 3/4 in. Sch. 40 PVC Pressure Slip x FPT Adapter - $0.44
- 5.5 inch length of 3/4 in. PVC Schedule 40 Pipe - $1.97 for 10 feet, $1.15 for 2 feet
- 3/4 in. Male Terminal Adapter - $0.46
- [A 1 inch diameter hole drilled through the bottom of your grow bed]
- #18 O-ring - $2.27 [for Box of 10]
- 3/4 in. Female Conduit Adapter - $0.50
- 5 inch length of 3/4 in. PVC Schedule 40 Pipe (already bought)
- 3/4 in. PVC Sch. 40 45-Degree S x S Elbow - $0.62
- 5 inch length of 3/4 in. PVC Schedule 40 Pipe (already bought)
Auto-siphon "Bell"
- 10 inch length of 2 in. PVC Sch. 40 Pipe - $3.69 for 2 feet
- 2 in. PVC Cap - $0.98
- 11 inch length of 3 in. PVC Sch. 40 Pipe - $5.95 for 2 feet
All told, the parts add up to about $20 if you're just building a single Bell Siphon. If you build two of them, they come in at $14 apiece. Or if you get a bunch of friends together to build 10 of these, the price comes down to $9 apiece (because you'll buy the 10 foot long lengths of 2-inch and 3-inch pipe - economies of scale).
Small system I put together for a Feb 2012 science fair
Now that you've got the parts, here's how to put it together:
Installing the Bulkhead fitting (the grey conduit bits and O-ring)
Assembling the Standpipe, Bell, and Media Guard
Different Discharge Options (I like the 45 degree or Coanda Discharge)