Why A Peristaltic Pump?
This is covered in great detail on the internet. In summary:
○ More reliable consistent flow
Read more about the official MasterFlex Calcium Reactor thread here. They are spendy, 200-400 dollars. And they are awesome.
(hint, if you can spare the reef $$, stop reading this and go get one!)
For me personally? I needed to babysit some SPS. I knew that my CR flow would dip and sometimes clog. Rather than risk someone else's coral I decided to step up the game a little.
Check out my flow before and after:
Why A DIY Peristaltic Pump?
The primary reason is simply to save money.
By saving money, you might be able to have a spare on hand.
For me, I try to have 2 of anything critical because reef stores are not open 24/7 and Amazon cannot ship fast enough to save your coral if things go wrong.
Building One - Parts
Pump and Motor - $30
The pump and motor itself. Search ebay for 'large peristaltic' and you will find this one:
Pumps come and go. It is nice to have one with:
§ At least two rollers (anti siphon)
§ Stainless steel bearings (not a plastic, noisy pump)
This setup requires a brushed DC 12v motor so that it can be PWM controlled. A better setup would be a stepper motor based motor and controller. Future?
Motor Speed Controller - $11
You want a PWM speed controller. This controls the speed so the flow can be dialed in.
Note: There are tons of cool options here. Web controlled, LED speed display etc. I did find though that certain PWMs cause the motor to overheat so you may need to experiment if deviating from this one.
Power Supply - $6.50
12volt 2 amp power supply with a wiring adapter.
Here is one on amazon:
It is better to find one that is UL Listed. Once you are past the power supply though, everything is low voltage.
The wiring adapter is key (the green thing in the pic). It makes taking power from the adapter simple, just turning a couple of screws.
Wire - Free to $16
If you have any kind of wire laying around that is 16 gauge or bigger, feel free to repurpose it.
Some wiring connectors such as 2 spade connectors can be soldered onto the back of the motor or possibly crimp
Building One - Assembly
The wiring is very basic and covered with the PWM controller documentation.
Basically the power goes from the power adapter, to the PWM controller, to the motor.
Everything is labelled, it is super easy.
The hardest part is attaching the wires to the motor. You can use a variety of methods, but a crimp on spade connector can work.
Be sure to use the right gauge wire. I used 16 gauge because I had some from other projects. It's nice to use 2 different colors, pick one such as red for positive, black for ground and be consistent.
There are allot of options. Mine is stuffed into a double gang electrical box ($2).
I just drilled some holes and routed wires.
Here is the inside
For more details etc check out this thread:
The results are detailed in another thread:
Tubing wears out and fails, you need to place the pump in a location such that if this happens, water will drain into the tank instead of onto the floor! Ideally monitor the flow with the APEX flow monitoring kit 1/4" adapter. That way when the tubing goes you can quickly replace it. Sound! This is a pretty quiet pump, but it is not as quiet as an MJ sitting underwater in the sump. So keep that in mind... Super Important: Don't turn down the pump so low that it does not run smoothly. That will overheat the motor as it is basically starting up from stopped several times per second. The pump should run smooth with no visible lurching...
Man, it would be nice.
Especially now that APEX showed me how wildly the flow varies off of my MJ1200 feed pump.
Flow is in liters per hour. That means I have been ranging from 56 mls/min to 98 mls / minute. I do have to think it would be much more consistent with the peristaltic...
Going to be looking for some cheap options as my reef budget will not allow for a good one at this point (400 dollars...)!
I am babysitting allot of coral. As a result, keeping allot closer eye on the tank.
The calcium reactor feed pump stopped pumping any amount of volume, and dkh dropped.
After troubleshooting I could see the feed pump was barely a trickle.
Fired up the APEX flow monitor. It is not rated for CR low flow rate, but it seems to work. Holding steady and keeps a history! Pretty cool way to monitor that cricital calcium reactor variable, flow... I have no alarms setup for it yet but if reliable definitely will...
It is getting to the point that I need to restock my Ca reactor and thought it might be a good opportunity to see what folk here recommend/prefer for media. There seem to be a few more widely available options like ReBorn (Little Fishes), ARM (Caribsea) and Reef Reactor (Seachem) but probably more that I am missing. Like many things reef, I would expect people to have some opinions on their relative merit and, of course, would be interested to hear those along with positive/negative experiences if you are willing to share.
Thanks in advance!
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