calculating head pressure

[nurseling]

Can anyone tell me what the head pressure on the pump in this photo would be this will be a 10" x 5.5" x 12" box with 4 baffles.

 

[sleepydoc]

No. The resistance of the box itself will be fairly low, but pipe will have more. You need to know the length of the pipe, the diameter and the flow to calculate the resistance.

Why do you have the pipe on the intake of the pump instead of the output?

 

[nurseling]

This is a reverse flow or up flow media reactor 1/2 intake and 3/4 out of the top.
So what your saying is the baffles in the sealed box should not make much of a difference?

 

[sleepydoc]

Likely not relative to the pipe. I didn't realize that the water was flowing vertically instead of horizontally, but if it's set up as a closed loop system with the return pipe essentially being a siphon that won't matter much.

If the chambers are filled with media, that will affect back pressure.

 

[nurseling]

head pressure

head pressure

With the above reactor and Syncra 0.5 pump with coarse Schuran calcium will I have enough circulation.

 

[uncleof6]

No, you are not going to want to set the pump up that way. Change the logic so the pump draws and returns to the bottom of the tank, rather than drawing from the top. Too much pipe for a small pump, especially choking the intake with 1/2 pipe, which is called "restricting the pump intake." Since your output line will be larger than the intake line, the pump WILL cavitate itself into component parts: impeller erosion, and possibly a bent main shaft.

As it is: the head on the pump will be ~double the water level difference between the the first section and the last section, plus the friction loss in the intake line. Not a very good way to install a pump. The pressure differential in the volute, will make the water "boil," e.g. hit its vapor pressure, and the pump will tear itself apart.

I don't pretend to know why you want to re-invent the wheel, (e.g. calcium reactor.) Generally folks are using a salt mix with an unnaturally high level of calcium (hyped so called "Reef Salt") to start with, and a calcium reactor simply drives it higher while alkalinity stays level or falls off, to the point it causes problems.