It's hard to tell but it looks like the flow is coming out slightly faster at the far end of the spray bar. Here is a video of the spray bar during the water change hitting the front glass. Some plants at the front actually got uprooted with the flow and I'm a little worried about the fish as they're not used to it. All of the plants are moving and swaying. I can confirm the tank looks like a washing machine now! Water is hitting the front glass and then travelling downwards. How important is this? I can try and talk the wife into helping at some point. Sadly it was too difficult on my own to physically measure the output flow due to the 1.3m spray bar. It took a bit of time but I finally got the spray bar installed yesterday. Let me know if I've misinterpreted something. I have used the Fluval spraybar set which comes in packs of two and includes a simple flexible rubber coupling to join the two sections.

Isn't 1/2 inch equal to 13mm? Is the 16/22mm tubing that you want to use also PVC or is it just the Eheim plastic tubing? If it is, then just use any plastic with a 16mm ID even if the wall thickness is thin and you can then slip the Eheim tube over it by running hot water over the end to make it more pliable. I wouldn't worry too much about the metal hose tail as long as it is stainless steel. The frictional losses due to tube length is miniscule compared to the loss due to choking. Mass flow rate in a tube is directly proportional to the cross sectional area, so that's a 38% drop in the flow rate. The jets should reach the front glass with plenty of force.Ī 14mm diameter tube has a cross sectional area of 154 square mm, whereas an 11mm tube has a cross sectional area of 95 square mm. PVC is cheap, so get a few and try different configurations. Longer bar runs might be problematic but experiment and see how it goes.

The 2260 has plenty of muscle to run a 4 foot bar. That's just the baseline calculation You may need to experiment with number of holes and hole sizes to either maintain the flow velocity, or, if the velocity is too strong, then enlarge the holes. So, figure out how many holes you want, and their spacing, and calculate the surface area of the ID (A=pi*R**2) and then divide that value by your number of holes. Again, the total surface area of all the holes combined should be at least equal to the surface area of the pipe ID. The effectiveness of the spraybar flow patterns is maximized when it's length is maximized, so that it covers as large a span along the back as possible. The ID will make a difference though, so keep this stock. Click to expand.The intake length is not really a concern and won't make a difference in practical terms.

Eheim 2260 filter