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bucfan
08/12/2017, 01:39 PM
I've been using Rowaphos for sometime and it's been working great. Recently I've had issues with PO running high despite running Rowa. I added new Rowa 6 weeks back and PO dropped from 0.5 to 0.1 in a week. 2 weeks back it was 0.03. Now PO back up to 0.57! Reactor is working fine so I can't understand how Rowa can be dead in 6 weeks and PO that high.


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Potatohead
08/12/2017, 01:46 PM
It only holds so much phosphate. If it removes a lot from the water it won't last very long but if the water is low in PO4 already it will last quite a while.

Reeferparty
08/12/2017, 01:59 PM
6 weeks is a pretty good amount of time imo. I use rowa and I typically change it every 4 weeks if time allows


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mcgyvr
08/12/2017, 02:18 PM
How much did you use?
How much water volume?
Or just do the math yourself..
100 g/100 mL RowaPhos will remove 3ppm of phosphate from 100 US gallons of saltwater.
250 g/250 mL RowaPhos will remove 3ppm of phosphate from 250 US gallons of saltwater.
500 g/500 mL RowaPhos will remove 3 ppm of phosphate from 500 US gallons of saltwater.
1000g/ 1 L RowaPhos will remove 3 ppm of phosphate from 1000 US gallons of saltwater.
5 kg/5 L RowaPhos will remove 3 ppm of phosphate from 4500 US gallons of saltwater.

bucfan
08/12/2017, 02:44 PM
It only holds so much phosphate. If it removes a lot from the water it won't last very long but if the water is low in PO4 already it will last quite a while.



Figure I need to switch it out. Strange why recently it's depleting a lot quicker than before. I have not changed my feeds.


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bertoni
08/12/2017, 08:16 PM
Also, after a month or so, the GFO surface probably is coated with bacteria, so even if it's not full of phosphate, it's not going to adsorb anything.

jda
08/12/2017, 08:46 PM
What likely happened in that when the water column level got low, that aragonite unbound phosphate back to "equilibrium" with the water. When this happened, then GFO was already used up and it rose again.

There is more to phosphate than just what is in the water column.

bucfan
08/12/2017, 10:08 PM
6 weeks is a pretty good amount of time imo. I use rowa and I typically change it every 4 weeks if time allows


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Thought Rowa lasts 3 months or do I have this wrong?


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jda
08/12/2017, 10:46 PM
It lasts until is has bound all of the phosphate that it can bind. That could be a few hours if they concentration in the water is high.

mcgyvr
08/13/2017, 06:48 AM
Thought Rowa lasts 3 months or do I have this wrong?

yep.. you have that wrong..;)

tmz
08/18/2017, 03:39 PM
IT may also bind calcium carbonate precipitant.