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CRYSTAL SUMP models come with dual platforms in the space before the return section. The top platform comes with a foam block filter and the bottom one is open to use for several different filtration methods (bag of carbon, bio balls, rubble rock, etc.). This feature is on the SUMP models only.
Locking Filter Sock Holder
Filter socks snap and lock into the filter sock holders to secure the filter sock from falling out when it becomes clogged and needs to be cleaned or replaced. The 4” filter socks are 100 micron rating.
Draw String Tabs
Tabs are located on the top support brace in front of the 1” bulkhead fittings which are included. The purpose of these tabs is to provide a location for tying off 7” diameter filter socks that have draw strings.
Trigger Systems specializes in aquarium sump manufacturing. They take pride in the robustness, efficiency of the design and visual appeal of our sumps. All sumps come with a full top support brace which are made of a solid piece of material. Without this the sump will over time begin to bow out from the humidity and water pressure. We also round instead of squaring the corners which exponentially increases the strength of the corner.
Trigger Systems has taken feedback from their customers through the years to enhance their line of awesome sumps. Little things in the design aspect will pay off considerably when putting the sumps to use. A simple example is that they always maximize the distance between the protein skimmer location and the return pump in an effort to minimize the chance for micro bubbles returning to the display.
Excepted better By Luke on 6/8/2017Luke would recommend this product to a friendThe sump was packaged every well, but there were still scratches in acrylic from the manufacturer. Also when they glue the sump, they glued a tiny bit of cardboard onto the acrylic which soaked up the glue and is not removable. The Skimmer section is a little small because they don't include the filter sock holder in the measurements. The Refugium is pretty large, but unfortunately the center divider is clear (should be smoked or tinted) which causes algae to grow on the skimmer and return pump camber. I would recommend the sump but the quality did not impress me.