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Old 08-10-2008, 05:29 PM   #1
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PH & ALK of Top off water

Do you dose anything to bring up the PH or alk of your RO/DI water used for top off?
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Old 08-10-2008, 07:11 PM   #2
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I dont dose for that. Mine stays pretty much on target with just weekly PWC`s. Where is your`s at that you think you need to dose for?
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Old 08-10-2008, 07:18 PM   #3
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My top off water alk is 3 and ph is around 7. I was just curious if people bring the ro/di number up closer to the tanks numbers or just leave them be.
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Old 08-10-2008, 10:38 PM   #4
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As far as the PH that seems right for FW. You`ll get the desired 8.2 - 8.4 when you mix in the salt mix for PWC`s. What is your alk and PH on freshly made SW and your tank water. Just wondering
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Old 08-10-2008, 11:24 PM   #5
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I pre mix my PWC and use a ph to adjust the pH of that water....not sure about Alk.
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Old 08-11-2008, 12:24 AM   #6
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I was referring to the RO/DI top off water that goes in the tank to replace evaporated water. Do you typically bring the PH or ALK up on that? My tank water has a PH of 8.0 - 8.3
I was just thinking maybe it would be more stable if my top off water had a higher PH and ALK.
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Old 08-11-2008, 01:18 AM   #7
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I don't do anything to my DI water for top offs. My pH and alk are very stable from day to day, though I do dose a 2-part for ca/alk every day.
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Old 08-11-2008, 09:18 AM   #8
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If you buffer your top off water, it's like dosing alk into your tank. When water evaporates, I don't think the sodium carbonate evaporates with it. I would think buffering top off water can easily throw your alk/ca balance out of whack.
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Old 08-11-2008, 09:50 AM   #9
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Thanks, I'll keep doing what I have been doing then which is leave the top off water as is, and dose the tank for alk and calcium
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Old 08-11-2008, 01:39 PM   #10
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That`s a good idea. I dont do anything to my top off water either.
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