Blumat set-up instructions work fine but getting the tiny air bubbles out of the cap lets you really fine tune the setting and makes the Blumat more responsive.
This Pipette makes it very easy to do that. After soaking and under water, use it to squirt water into the underside of the cap- where you see the 3 white ovals. It's not a big deal and not necessary but we think this will make the Blumats respond a little more quickly to dry and wet conditions.
You can also use this to add Drip Clean and/or concentrated H2O2 to your res as well as any kind of concentrated nutrient or additive. There are many, many ways to use these