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Old 04-02-2006, 06:21 PM   #11
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Originally Posted by JG
Right... but remember that for every one calcium ion, you are taking out two carbonates.
Actually, since Ca is a 2+ ion and carbonate is a 2- ion, they would be a one to one ratio.

I hope that my replies aren't being taken as my being unappreciative of the comments given; I am just trying to figure out how I can fix this problem.

Thanks again,
Chris
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Old 04-02-2006, 07:29 PM   #12
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Please test for mg. It should be roughly 3 times the ca level. A good set of numbers to see would be dKH 8 - 11, ca 400ppm with mg at 1200 - 1250 ppm or ca 450ppm with mg at 1350ppm and of course ph 8.1 - 8.3

This is a good general read and may help..

http://www.wetwebmedia.com/alkalinity.htm

Peace.
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Old 04-02-2006, 09:22 PM   #13
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"Actually, since Ca is a 2+ ion and carbonate is a 2- ion, they would be a one to one ratio."



Nice catch - I was thinking " bicarbonate ion " which has a 1- charge while thinking of Kents Superbuffer which used sodium bicarbonate as one of the buffering agents.
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Old 04-02-2006, 10:05 PM   #14
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My calcium stays at 420 with just PWC twice a week. I use oceanic salt. I`ve never tested it before it goes in but I will next time. If you have corals you will experience a depletion of calcium and trace elements. This can easily be restored doing PWC. As i stated earlier Just PWC alone keep mine over 400 which is what you need for a reef tank
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Old 04-02-2006, 10:08 PM   #15
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My calcium stays at 420 with just PWC twice a week. I use oceanic salt. I`ve never tested it before it goes in but I will next time. If you have corals you will experience a depletion of calcium and trace elements. This can easily be restored doing PWC. As i stated earlier Just PWC alone keep mine over 400 which is what you need for a reef tank
That may be a solution a bit down the road--switching brands. When I mix Instant Ocean, I am getting a calcium level of 320 ppm (for the freshly mixed SW).
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Old 04-03-2006, 03:27 PM   #16
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IO has been known for a low Ca reading, Oceanic for a high Ca but low pH. Kent has been all over the place but my last two buckets were very low in Alk/pH and Kent found the same in the samples I sent them.
Have you checked your magnesium level yet.

You may need to supplement with something like Kent's superbuffer AND turbo-calc (calcium chloride) till you get a balanced/stable reading.

I have now switched to Tropic Marin which give me better readings on my new mix. I'm still supplementing with Turbo Ca for my corals.
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Old 04-03-2006, 07:20 PM   #17
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If you have a large coral population it will deplete your calcium. You may need calcium suuplement. I know before I got my RO/DI the guy I got my saltwater from added buffer to the water while mixing it. I have found oceanic to be meeting my needs though
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Old 04-03-2006, 10:15 PM   #18
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If you may, I consider pwc an effective way of replacing trace elements in your tank. Some of those trace elements are available in fresh water itself and ofcourse your salt. Nitrates are dominantly affected by this pwc.

If you have calcium problems, instead of trying to calculate the chemical ions whatevers (which I highly respect of all of you, by the way, because I now have a clue at what buffers do ion-wise. Thanks! It makes more sense now) why not buy purple up or something and add those additives according to instructions until you get your desired calcium?

They're only about $14 a pop. Saves me a lot of stress trying to get to the bottom of calcium depletion or pwc calcium deficit. Just add more calcium.
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