How to build your own aquarium auto top-off system
Click on the links below to see the instructions for
our two Top-it-Off Kits. These kits provide all of the components
needed to build a top-off system and show you step-by-step how to build one.
You can purchase one of our kits or read over
the instructions and create your own custom system using components from our
auto top-off components and
Top-it-Off Kit Premium assembly instructions
Top-it-Off Kit Deluxe assembly instructions
Description of our
Top-it-Off Kit Premium product
Description of out
Top-it-Off Kit Deluxe product
The kits are similar - the primary advantage of the
Deluxe kit is that it offers an extra float switch. This can be used
to protect the pump in your reservoir from a run-dry condition if the
reservoir should become empty.
Components used in our kits or to build a top-off
system of your own design:
i-float float switches
Slosh & Snail Guard
12 volt DPDT relay
package of crimp caps
GFCI extension cord
large project box
pump (we sell the
Maxi-Jet 600 and the
tubing (1/2" ID - fits
Maxi-Jet 600 only)
PLEASE NOTE: Building a top-off system involves household 120 volt electricity, which, if
mishandled, can cause shock or death by electrocution. Do not attempt
this project if you are not comfortable working with electricity.
Proceed with this project at your own risk.
No system is 100% reliable. Many of our customers
have assembled a top-off system using our guides with excellent success, but
float switches, relays and DIY set-ups can sometimes fail (as can all
mechanical devices and even professionally manufactured solutions).
Use common sense when sizing your reservoir and using and maintaining your
system. You should be able to design a system that will top-off your
sump for 3-4 days and never cause an overflow even if some part of the
system has been assembled incorrectly or fails.
Never allow the top of a float switch (where the
wires come out of the stem) to be submerged in water. The epoxy
potting is not designed to be water proof. Water will eventually penetrate
the switch and cause a failure. If
you must mount a float switch where the top will be submerged, see
Also, check out our new webpage for our 12 volt