Cost of Wet vs, Dry Ferts - The Planted Tank Forum
 
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post #1 of 3 (permalink) Old 12-31-2015, 02:52 AM Thread Starter
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Cost of Wet vs, Dry Ferts

Did a comparison today of Flourish phosphates vs. dry
Just a FYI for those debating dry ferts.

Flourish Phosphate @ 4500ppm vs. KH2PO4 equivalent.

1 lbs. of KH2PO4 is $4
5 cases of bottled R/O water @ $16.65, $3.33 per case of 500ml.
This makes 226 250ml. bottles = to Flourish equivalent.

If Flourish was used net cost would be $2165.00 and change.

A ratio of 1::105

Based on an Evilbay seller @ $9.58 including shipping per 250ml bottle.
Dry mixed cost = $.09 per bottle.

I am in no way beating the Flourish line of products but,
that's a lot of money right there.
My first set of ferts was the Flourish line but now all dry mixed solutions.
Only did the entire Flourish line only once.

I have not compared the other solutions, PO4 has been my deficiency up till now.
Anyone else looked at the math in this way?


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Last edited by Maryland Guppy; 12-31-2015 at 02:54 AM. Reason: missed
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post #2 of 3 (permalink) Old 12-31-2015, 03:04 AM
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Yeah, it's been done, and there's never been any question that dry ferts are *far* cheaper than wet ferts. ...Though I'm not sure how many do the math.

Right now, however, with the big to-do about possible toxicity in one or more of the micros (possible, given a fairly specific set of paramaters, but that's enough to make people start thinking, and worrying), people are looking for other ratios. And since only a handful of the many micros in CSM+B are available, individually, at reasonable prices, in useful chemical forms, there's a renewed interest in wet ferts ...micros, at least. People are scrounging for the right combination that will allow them to cover the expensive elements with a premix, while being able to add the cheap elements in other, preferably dry, forms, without overdosing the potential problem elements.

So, with dry ferts, it's a no-brainer (mix your own, you lazy bums ). But with micros, it's a little more of a gray area. Which is unfortunate, since the micro mixes are pretty expensive.
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post #3 of 3 (permalink) Old 12-31-2015, 03:16 AM Thread Starter
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Due to the micro threads we all know about.
I have cut mine in half and have seen no deficiency.
I dose PPS Classic which is a low dose anyway.

In regards to macro I dose more than PPS-Pro but not as much as EI.
Water testing has proven the uptake on macro ferts.
I try to dose little more than the plants consume every other day.


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