fertiliser dosing pump for aquarium

Step 3 Adding to setup

At first of all you need to figure out the flow rate. Grab some watch and measure flow over one minute. You can use syringe to measure amount of water, or whatever you know volume or scale (remember 1g water =1ml water)
My pump got quite convenient flow rate which is ~5ml/minute.
If you have ready fertiliser (bought from a shop for example) and the rate didn't fit to one minutes, you might recalculate and mix fertiliser with demineralised water.
For example: you peristaltic pump got flow rate 7ml/min you want to add 5ml of fertiliser at once, and you have 200ml of the fertiliser, the math is:
7/5=X/200ml => X=7/5*200ml => X=280ml that's volume of the fertiliser mix. Now 280-200=80ml you have to mix 80ml of water with fertiliser, to get right amount of nutrients in one minute.
If you making your own fertiliser just simply recalculate you mixture, and add right amounts of powders to water. (but if you're enough experienced to make your own PMDD I don't need to explain anything)
Useful links:
http://www.theplantedtank.co.uk/PMDD.htm
http://www.theplantedtank.co.uk/calculator.htm
Now timer, I've setup mine about 20 minutes before lights on, but depends on preferences. Again, on the internet you can find plenty of tutorials how and when dosing.
I've sicked the other end of the tube (outlet) to canister filter outlet just above the water surface so water is mixing instantly with the drops of fertiliser.
Final step is deaerating tube. Just run the pump for a while and see when liquid will reach the end of the tube, that's all.
Good luck.