Around the same time I ordered the pH pen, I upgraded the filter from an eheim 2211 to a fluval g3. The water has been astonishingly clear, and it gives 185gph of actual flow, which is enough to eliminate the need for a circulation pump. The filter screams quality, and everything about it is simple, easy, and intuitive.
The body of the filter is made of a thin but sturdy plastic, and the trim around the bottom is actually made of the same material rather than metal. The top is also made of the same plastic, except for the handles, which are all metal. The only exception is the tubing quick release handle, which is a solid piece of the before mentioned plastic, presumably so it would match the rest of the filter since it sits flush.
The inside of the filter was even nicer. The media baskets along with the sleeves for the mechanical and chemical media are all made of an even nicer plastic. The media it came with was also quite nice. At least as far as looks, the biological media seems comparable to substrat pro, although the mechanical and chemical media are much nicer. The mechanical media is actually not a sponge like in most filters, but a mesh tube with deep vertical ridges. The chemical media was similar in shape, with the only difference being the ridges. So far the nitrate hasn't passed 20ppm, and the water is clearer than the water in the 210, which I consider very clear, that runs a sump with 4, 200 micron filter socks at 1400gph.
One of the biggest selling points for me was the ease of maintenance. Two weeks and one plant trimming in, I cleaned the mechanical media. It was as simple as lifting the main handle, opening the lid, pulling out the media, and cleaning it with the included brush. All this was done within 5-7 minutes, and without needing to unplug the filter. I haven't needed to clean the chemical media, but I assume it's rechargeable, or at least the container that holds the media is reusable. The biological media will take more time to clean, although it's also a simple process. The four handles on the side need to be pulled, then the top of the filter can be removed and the media accessed.
The filter is also highly customizable, much more than I originally expected. The date, and time can be changed, along with the amount of time it takes for the display to time out. On top of this, it provides graphs of the water's temperature, conductivity and flow, over the past 48 days. If any of which fall outside of the set range, the display will flash on and off with an alert screen. I believe the conductivity is set to 300-600 out of the box, and temperature at 72-80, although both of which can be set to the users' preferred range. The flow range is the only one that cannot be alerted, which isn't an issue, as there isn't really a need to.
This post became much more of a review than I wanted it to be, but I wanted to go in detail about the filter because there isn't too much information about it outside of what Fluval provides.