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Old 09-20-2007, 03:38 AM   #11
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Doesn't RO/DI make water acidic? I have an RO/DI system to drink out of, and I tested the Ph of the end product and it was around 6.0 with the tap being around 7.6. My tap water is very HARD with calcium, Phosphates are practically nil, and my Ph hangs around 8.2 all by using tap water. Very little diatoms and no cyano. Will I need to add calcium to get the Ph where I need it from using RO/DI?
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Old 09-20-2007, 04:44 AM   #12
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Quote:
Originally Posted by darrinf15e
Will I need to add calcium to get the Ph where I need it from using RO/DI?
IME I dont add calcium to keep mine at 8.4. Just do frequent PWC`s. Salt mix has alot to do with it also.
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Old 09-20-2007, 09:05 AM   #13
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Calcium has no affect on pH. You can raise your pH by adding baking soda, if necessary.

@koolaidman3 - just curious, have you tested the TDS of your tap water? Not what the water co. told you, but what your actual reading is at the tap.
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Old 09-20-2007, 09:33 AM   #14
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One thing to keep in mind... this is a very expensive hobby and $100 on an RO/DI system is a very minor investment in the grand scheme of things. It's one of the best ways you can spend $100 on your tank. Besides, you'll probably spend more money correcting issues like algae, cyano, etc that you could have prevented through an RO/DI unit.
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Old 09-20-2007, 11:40 AM   #15
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Quote:
Originally Posted by darrinf15e
Doesn't RO/DI make water acidic? I have an RO/DI system to drink out of, and I tested the Ph of the end product and it was around 6.0 with the tap being around 7.6.
As it was explained to me by some folks that know alot about RO/DI, doing a pH test on "pure" water (either RO/DI or just DI) is pretty much pointless because the water has been stripped of everything. The 6.0 reading is kind of a false reading because the testing relies on the presence of electrolytes in the water. With RO/DI water, you've stripped it of everything so it's really neither acidic or alkaline, but it isn't really neutral either. Even the tiniest of impurities that may sneak through can throw it off one way or another.

I'm pretty sure I didn't relay that information 100% as I heard it (!), so please correct me water chemistry gurus if I misstated something in there.

Either way, your salt mix will take the pH right back to where it needs to be with nothing extra.
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Old 09-23-2007, 01:04 AM   #16
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no cccapt, i havent checked the tds, how would i go about doing that?
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Old 09-23-2007, 09:02 AM   #17
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Originally Posted by cccapt
You can raise your pH by adding baking soda, if necessary.

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Adding baking soda can cause precipitation and crash . If adding it do so just a small ammount at a time and monitor closely never dose till you get it where you want it at once do so over days/weeks. You would be better off keeping the water airated with ph's pointed to the surface and an open top , as well as water changes .
You really dont want to add if you dont have to , also a couple other things , if the tank is new it will also be a bit lower , when testing with the lights on/off it will make a diffrence in your readings as well ...
I use to dose Baking soda till I changed the top for egg crate pointed the power heads to the surface, placed a fan to move air , opened the windows and then upped my h20 changes , I have NOT once had to dose . My tank is nearly 3 years old now and I have a ph of 8.4 consistantly with out doseing
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Old 09-23-2007, 10:29 AM   #18
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@koolaidman3 - you need to buy a TDS meter. They run aprox $20. You can check Ebay or just about all the online places carry them too.

@Sadielynn - FWIW, baking soda (or baked baking soda - soda ash) is what's used as a buffer to raise your alk. If you ever dosed anything to raise your alk, you dosed baking soda or soda ash. Baking soda will raise your pH, while soda ash has little to no affect on pH. I would not use it just to raise pH, but it definitely will.
I never heard of a tank crashing because of alk dosing...which is what you are doing when dosing baking soda.
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Old 09-25-2007, 11:18 PM   #19
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Baking soda will raise your pH,
Just too clarify for anyone who maybe trying this, baking soda (sodium bicarbonate) will only increase PH after it is baked for an hour or so at ~300 deg. to drive off the excess CO2(basically it becomes sodium carbonate AKA washing soda after baking). If used right out of the box, and not baked, it will actually lower the PH of the tank slightly. Either way, it is a great, cheap way to increase Alk.
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Old 09-25-2007, 11:20 PM   #20
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If adding it do so just a small ammount at a time and monitor closely never dose till you get it where you want it at once do so over days/weeks.
Not sure if you know about this, but you may find it useful when dosing in the future-

http://home.comcast.net/~jdieck1/chemcalc.html
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