Traditional screen filters draw from the bottom of the kettle —
immediately sucking all pellet hops and fine break material into the
screen, where they plug. In Blichmann Engineering's HopBlocker™,
preferential flow leaves settled fine break material (hops and trub)
undisturbed at the bottom of the kettle while draining the majority of
the wort through a coarse filter from the top down. When the wort level
is just a couple of inches from the bottom of the kettle, the fine
filter element is then exposed by lifting the shield, and the remainder
of the wort is filtered. It's an intuitive design that allows the fine
filter to work only on a small portion of the wort, not all of it. The
HopBlocker™ will filter up to 95% of the break material and hops from
your wort without plugging. While it is designed specifically to
complement Blichmann Engineering's BoilerMaker™ brew kettles, the
HopBlocker™can be installed in any manufacturer's kettle or keg.
PLEASE NOTE: The HopBlocker is designed for use with pellet hops only. Whole/loose hops will plug
the unit. While using whole hops, or a mix of whole and pellet hops,
you must bag your whole hops in a large muslin grain bag. This will not
affect the utilization rate and will result in significantly less wort
THE PROCESS IS UNIQUE, BUT SIMPLE
1. Install the HopBlocker™ into the kettle using the snap-in dip tube. This takes only a few seconds.
2. Ensure that the shield is pushed all
the way to the bottom of the screen and that the HopBlocker™ is resting
flat on the bottom of the kettle. Proceed with your boil as you
normally do. The HopBlocker™ may move a bit during the boil, but this is
not a problem. It will automatically right itself.
3. At flameout, vigorously stir
the wort with a paddle to create a whirlpool. This encourages the hops
and trub particulates to settle to the center of the kettle, away from
4. Allow 15 to 20 minutes for thermal convection currents to slow and allow the break material and hop particulates to settle.
5. Drain your pot as fast as you'd like until you see the top of the kettle drain fitting (about 3 inches of wort).
6. Reduce the drain flow rate to about
one-third of the initial flow rate. This allows the wort to slowly
permeate through the hops and trub without dragging them to the filter
where it may plug.
7. Use your paddle to hold the filter
down and quickly pull the shield up with a gloved finger or a racking
cane to expose the fine filter on the bottom of the HopBlocker™. It is important to quickly complete steps 6 and 7 so you do not lose the siphon, which will stop the flow.
WHOLE HOPS RECOMMENDATIONS
Loose leaf hops generally plug the coarse screen. Therefore, we
highly recommend using large muslin grain bags to avoid plugging. In
addition, you lose a large amount of wort from leaf-hops absorption.
Using a bag, you can squeeze most of the wort out with negligible effect
on hop utilization and significantly easier cleanup. This method does
not work for pellet hops because they pass through openings in the
muslin bag. And finer mesh screens do not freely allow wort to pass so
hop utilization is negatively affected.
INSTALLING IN NON-BOILERMAKER™ Kettles
The HopBlocker™ was specifically designed for use in Blichmann
Engineering BoilerMaker™ brew kettles. However, it can be installed in
other manufacturers' equipment. A 1/2" outside diameter drain tube with a
90-degree bend (not included) must be installed, with the bottom of the
tube between 3/8" to 1/2" from the bottom of the kettle or keg. Because
you can't rotate the tube to thread it into the inside of your pot when
the tube is inserted into the HopBlocker™, you will need a flare or
compression connection so you can tighten the tube in place without
turning the tube. Try to locate the tube so that the HopBlocker™ is as
close as possible to the sidewall of the pot. For kegs, you will need to
install the HopBlocker™ in the center of the kettle due to the rounded
bottom, reducing the HopBlocker's™ effectiveness.