Make a simple, cheap adjustable float switch for switching on an top off pump.
1) Take a common float switch (might also be called a level reed switch, I'm not sure). The one in the picture below fitted snuggly into the 25mm PVC T-Joint. If it doesn't, you can use any strong reef safe glue to hold it in place. See picture below:
2) Take a 25mm -> 20mm reducer bush and insert it into the other end of the T-Joint. I used PVC-U from Tangit but a better known product is PVC-Weld. See picture above.
3) Join, into the reducer bush, a piece of 20mm PVC pipe. Use your discretion to judge how long it must be. See picture below.
4) Take another 25mm T-Joint and bond it to a 25mm elbow joint (90 deg.) using a small piece of 25mm PVC pipe in between. Here come a bit of trial and error. Saw the piece of PVC pipe just long enough so that the two joints fit perfectly and leave a gap slightly bigger than the thickness of glass you intend on hanging it onto. See picture below. This way the glass it will be hanging onto will fit snuggly into the (white below) gap.
5) Drill a hole for a small screw to fit into the second T-Joint as in the picture above. If you have access to Nylon screws/bolts, use that. Stainless steel should be ok to use.
6) Now, insert the pipe from 3) through the fitting you created in 4). Hang it onto your sump glass and tighten the screw at the right depth. See image below:
1) Take a common float switch (might also be called a level reed switch, I'm not sure). The one in the picture below fitted snuggly into the 25mm PVC T-Joint. If it doesn't, you can use any strong reef safe glue to hold it in place. See picture below:
2) Take a 25mm -> 20mm reducer bush and insert it into the other end of the T-Joint. I used PVC-U from Tangit but a better known product is PVC-Weld. See picture above.
3) Join, into the reducer bush, a piece of 20mm PVC pipe. Use your discretion to judge how long it must be. See picture below.
4) Take another 25mm T-Joint and bond it to a 25mm elbow joint (90 deg.) using a small piece of 25mm PVC pipe in between. Here come a bit of trial and error. Saw the piece of PVC pipe just long enough so that the two joints fit perfectly and leave a gap slightly bigger than the thickness of glass you intend on hanging it onto. See picture below. This way the glass it will be hanging onto will fit snuggly into the (white below) gap.
5) Drill a hole for a small screw to fit into the second T-Joint as in the picture above. If you have access to Nylon screws/bolts, use that. Stainless steel should be ok to use.
6) Now, insert the pipe from 3) through the fitting you created in 4). Hang it onto your sump glass and tighten the screw at the right depth. See image below: