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#1
09-26-2012, 07:29 PM
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IMO, 'if it ain't broke, don't fix it'. How much GFO you should use, flow rate and frequency of changing it will depend completely on your system; things like RODI vs tapwater, feeding regime, skimmer efficacy etc. will be different for everyone and dictate what your needs will be. The only way to determine how much to use is to start with the basic amount suggested by the product guidelines and watch what happens. You may want to test your PO4 now with something like a Hannah colorimeter to see what levels your tank is currently happy with. I often see the number 0.03ppm quoted as a desired target, but if your tank is happy and measures different, I would target for your current value. Adjust volume of GFO and flow rate to keep it there. This might require testing your PO4 every day or two for a couple of weeks to get things dialled in. Perhaps a good low range PO4 tester would be a good thing to borrow or buy for this period. If your corals start losing their colour, it may be an indication of too low of a phosphate level. As for rinsing, I always rinse all media with RODI water until it rinses clear.
Dan Dan
__________________
Link to my Tank Upgrade Thread Dan Leus, Marine Biologist 20+ Years Marine Aquarium Experience Save the Reef, Buy a Frag! 
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#2
09-26-2012, 07:44 PM
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I use ROWAphos and I run new salt water (nsw) through the reactor before I actually hook it back into the system when I replace it (the equivalent of rinsing with nsw, IMO). There are a LOT of smaller particles that find there way into the display with new ROWAphos. I actually think all of those particles may be what killed my elegance.
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#3
09-28-2012, 06:40 AM
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Thanks for the reply guys, i'll be sure to test my phosphate to see where my levels are at before i start using GFO.
in regards to rinsing, would i be exhausting the media too much if i rinse it under the tap?? its going to be in a media bag. seems easier and more efficient under running water than if i use RODI, i would just dip the media bag in a container of RODI water. and with the corals losing their colour, will all corals lose their colour?? or mostly just SPS? i have mostly LPS and softies and just a few SPS corals.
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