Peristaltic Pump for PMDD
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Old 02-24-2004, 02:06 PM   #1
sailher
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Has anyone used a Peristaltic pump to dose PMDD? I would assume "watering down" the solution? What may be the con's of this approach. I'm looking for a more automated solution.
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Old 02-24-2004, 02:20 PM   #2
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What is the minimum flow rate for the pump? You might have a problem keeping the nutrients in solution, or with algae growing in the reserve tank. But those are problems that can be overcome.
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Old 02-24-2004, 02:21 PM   #3
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Eheim sells a product called Liquidoser. You can buy at at Bigalsonline for $45. Of course a peristaltic pump would work as well, but aren't these fairly expensive? I have only seen them in labs where they cost a fortune.
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Old 02-25-2004, 12:19 AM   #4
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Kinda what I figured. Yes, the pumps are like $200 bucks but are very useful. If the liquidoser had a suction pump and a hose output connection, it might be more attractive.
I don't know the minimum rate as most list maximum. I'll see what I can find.
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Old 02-25-2004, 01:29 AM   #5
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I think the minimum rate on the nicer pumps is well within what would be needed for fert dosing. You can also set them to just go on at certain times of day for however long so maybe you could time it with your lights or have it go off for the day before your water change or whatever. They can draw from a source a little distance from the pump so you could mix up a big batch of PMDD in a five gallon bucket and just put the intake tube through a hole in the lid.

Post some follow up if you get it all set up, I'd like to see what you figure out.

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Old 02-25-2004, 02:24 PM   #6
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Here are the flow rates for the pump I'm looking to get. I found it for under $100 bucks with water level shutoff control. Its DC powered and desiged to run in vending maching applications.
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0.19 mm ID 0.02 to 0.13 mL/min
0.25 mm ID 0.03 to 0.18 mL/min
0.51 mm ID 0.12 to 0.7 mL/min
0.89 mm ID 0.36 to 2.13 mL/min
1.14 mm ID 0.55 to 3.3 mL/min
1.42 mm ID 0.8 to 4.9 mL/min
2.06 mm ID 1.5 to 8.9 mL/min
2.79 mm ID 2.1 to 12.3 mL/min
My concern is the minimum Inside Diameter (ID) I will need for PMDD. I've just received the chemicals and will mix my first batch up this weekend. What is the minimum size I'll need with the standard Macro nutrients. Or will the disolve?
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Old 02-25-2004, 02:32 PM   #7
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If your PMDD nutrients completely disolve in water (which they should) then you can use the smallest diameter you like. If your chemicals do not completely disolve (if they are cheap and have impurities) you can filter them through a coffee filter, before you put them into your pump reservoir.
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Old 02-25-2004, 02:57 PM   #8
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Considering the dilution factor you will be using, there shouldn't be any problem dissolving the PMDD. You can set this pump up as your daily top off, making up for any water lost to evaporation. I think reef keepers do something similar with kalkwater, however that is spelled.
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