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Re: PMDD problem

Hi Martyn.  I am using the PMDD made using Plantex CSM that Tim Mullins
published back in April.  I use the same dosage he specified in the
listing.  I am not a gardning type but my aquarium is doing great.  I am
able to adjust the iron to the desired level without difficulty.  I would
recommend getting the LaMotte test for nitrate and iron.  They are really
expensive for an initial outlay but the refils are reasonable, they last a
long time and best of all, they work well.

Onisk5vkq at ix_netcom.com

>Hi from Canada:
>I am having great difficulties obtaining appropriate iron
>concentrations using PMDD. I'm using the Sears recipe and dosing
>recommendations as found in the Krib .
>The water here is absolutely brutal so I'm forced to use 100% RO for
>I am using a Sera test kit. When adding PMDD at recommended dosage to
>100L RO during water changes my test kit registers zero ppm iron.
>I then did a test adding PMDD to 1 litre of RO. It took the addition of
>approx. 1 ml PMDD to read between 0 and .25mg/L iron content.
>This means that I would have to add 100 ml PMDD to my 100 L of change
>water? Can this possibly be right?
>Having said all that, I inadvertently left a completed iron test on the
>counter last night that had indicated zero iron after the 3 minute
>waiting period as indicated by the mfg.
>When I looked at it this morning the test registered 0.5mg/L iron
>content. Could it be that the test actually took this long to read
>The plants in the tank are somewhat stunted (except for a couple of
>Apongeton crispus) could they be starving due to lack of iron? (the tank
>has a laterite substate).