I just picked up the eheim pro series3e 700 for cheeeap. Prior to this filter I ran a Sun sun Can filter(manual also wrong). I have a feeling the people that had it before me were having issues with it as they had the wrong model media loaded, which is significantly smaller. The 700 is massive! Very awesome capacity.
After much research of proper media order for this filter, I thought I would share what I have found after hours and close study of the poorly interpreted manual.
Almost all manufactures list the media order incorrectly. Nearly all can filters work the same way. Water enters inflow tube from the tank, flows bottom to top of filter and back out to outflow tube in the tank.
In all cases Media should be loaded in the following order from inflow. Course Mechanical media, Fine Mechanical media, biological media, Chemical media.
The pro series is an exception to other can filters. It has a top accessable,“prefilter section” that the inflow water hits first, before going into the bottom of the canister. They do this for easy maintenance and quick exchanges of course mechanical media instead of having to dig to the bottom of filter, which is the typical arrangement for most Can filters.
Eheim confuses the media load in the manual showing the fine mechanical media as the last layer, after bio/chem media. THIS IS WRONG. It should be loaded in the same chamber as the prefilter(blue).
Ideally put it ontop of the course prefilter(blue)to protect all four trays from small sediment(polished water) to biological/chem media layers. This filter will adjust and maximize flow depending on how contaminated the pads get.
The alternative Method is to lay the fine mechanical media pad down on the most bottom tray and fill the rest with bio balls or ceramic media , ect, ect, but will make it more difficult for quick exchanges.
Or as I have done, forgo the prefilter section entirely and load Course mechanical/Fine mechanical media into the very bottom tray, identical to others. The prefilter course mechanical (blue)provided is weak(thin)I use the bottom tray exclusively for customized mechanical media instead. as mentioned its a bit tougher to get to, but will provide best efficiencies within.
The manual is terrible to follow. But if you look closely at the flow diagram, It does show how this filter flows(red arrows). I have attached for referance.