Liquid vs Dry dosing
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Old 05-21-2013, 05:04 AM   #1
Mrbluepanda
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Liquid vs Dry dosing


Hi, I was wondering is there any difference between dosing dry fert straight into a tank or mix them in to a 500ml bottle and dosing 5ml per 10 gallon better. I would be using the EI method for dosing. I'm also wondering if I go with the liquid solution and I dose three different tanks would I need different bottles for each tank? Basically what I'm asking is how much do I of the maco and micro fert do I dose into the liquid bottles. Also what is the difference between Iron Chelate 10% DTPA and Iron Chelate 13% EDTA.(Which is better) Finally is Magnesium Sulfate, Calcium Nitrate (CaNO3), and Calcium Sulfate (CaSO4) necessary?


Thanks for the help!
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Old 05-21-2013, 06:20 AM   #2
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No difference, some people just think liquid is easier and more precise. Micro Nutrients may also grow fungus in liquid form. Add excel or vinegar and put in fridge to retard this growth.

Use this dosing calculator: http://calc.petalphile.com/ you can use the same bottle, just increase your dose by the percentage increase of your smallest tank. (i.e. if you calculate based on a 50G tank and dose 5ml per day, you can dose from the same bottle for a 100G tank by dosing 10ml)

10% just means less iron and more EDTA, this will make the iron oxidize slower thus available to the plants longer but at the expense of being harder to absorb.

All the calcium stuff depends on your tap water hardness levels.
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Old 05-21-2013, 12:35 PM   #3
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I use liquid dosing instead of dry dosing because I primarily maintain smaller tanks where it can take a bit of effort to get ferts to dissolve. When dosing dry in tiny tanks, I put them in a cup with some tank water until they dissolve. Liquids speed things up for me. Using bottles with little graduated chambers for measuring makes it easy.
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Old 05-21-2013, 04:52 PM   #4
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For automated dosing, liquids tend to be preferred for obvious reasons, smaller tanks etc also, tends to be easier.

For larger tanks, dry is the best way if you do it manually IME, anything 20 Gallon and up.
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Old 05-23-2013, 04:41 PM   #5
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Is it ok to mix all the dry Macro nutrients into a single liquid solution, or should I keep them separate?
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Old 05-23-2013, 06:34 PM   #6
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Quote:
Originally Posted by bigd603 View Post
Is it ok to mix all the dry Macro nutrients into a single liquid solution, or should I keep them separate?
All macro in one and all micro in one
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Old 05-23-2013, 09:43 PM   #7
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Quote:
Originally Posted by samwoo2go View Post
All macro in one and all micro in one
+1

Thats my strategy too
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Old 05-23-2013, 09:55 PM   #8
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Cool, thanks guys. Im working on an Arduino (or if im feeling super awesome[read:nerdy], Beaglebone) based automated doser, and having just 2 peristaltic pumps is going to make this much cheaper than one for every nutrient.
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Old 05-23-2013, 10:17 PM   #9
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Heck yes! i just built one and love it.. makes life much easier.. And if you get stuck.. your in luck, because i posted schematics and code for my Arduino automated doser
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Old 05-23-2013, 11:05 PM   #10
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Hey Shift! Your build actually inspired me to start making my autodoser! I found it through the Feedly app. It's very cool and very impressive. I might just have to hit you up if I hit any roadblocks.
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Old 05-23-2013, 11:15 PM   #11
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Default Liquid vs Dry dosing

Defiantly. Let me know
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Old 05-28-2013, 01:55 PM   #12
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Hey, Shift. You used the L7805cv 12v voltage regulator for your build, but my RadioShack only has the plain ol' L7805 (http://www.radioshack.com/product/in...ductId=2062599). Is that basically the same thing, and should it work just as well?

Also, will this power supply work for 3 12v peristaltic pumps:
http://www.adafruit.com/products/798

Thanks!
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Old 05-28-2013, 02:36 PM   #13
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Default Liquid vs Dry dosing

Yep both those should work. I would have to look at the rating on the pumps. If you run them one at a time you are for sure good. All at once is questionable but probably safe. They were fairly low power
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Old 06-06-2013, 05:23 AM   #14
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So I have two pumps set up on an Arduino Mega in PWM pins 10 and 13, but only pin 10 works properly at a time. Pin 13 will always run, even if I set the code to:

Code:
int motorPin1 = 13;
int motorPin2 = 10;

void setup() {
  pinMode(motorPin1, OUTPUT);
  pinMode(motorPin2, OUTPUT);
  
  analogWrite(motorPin1, 0);
  analogWrite(motorPin2, 0);
}

void loop() {
  analogWrite(motorPin1, 0);
  analogWrite(motorPin2, 0);
}

motorPin1 will always run at a slow speed. It will ramp up speed if I set the PWM pin higher, but will always run even if set to 0. Its not just the pump, if I switch wires, the other pump will start acting up (but always on pin 13). There must be something funky going on with the connection. Any clues to help me know where to look?
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Old 06-06-2013, 06:39 AM   #15
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Is your transistor wired up correctly?
Are you using a resistor between the transistor or mostfet and the arduino pin?

If all else fails try using pin 11 instead of 13
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12G Fluval Edge - Celestial pearl Danios, Boraras urophthalmoides & PFR shrimp
5.5G Fluval Chi - Pumpkin shrimplets
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