high PH what to do? - The Planted Tank Forum
 
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post #1 of 6 (permalink) Old 11-12-2007, 03:42 AM Thread Starter
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high PH what to do?

the ph out of my tap is over 9 - my gh is 1 and my kh is 5 according to my hagen test kit. when i try and adjust with acid it bouncecs right back - can i use this water in a planted tank? the water here is fairly soft, but i think the water company limes it - hence the high PH - how would i deal with dosing CO2 in my tank - i have not started the tank yet, but plan to. TIA, john
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post #2 of 6 (permalink) Old 11-12-2007, 04:09 AM
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Same issue here. After some investigation I found out the water company buffers the water with an orthopolyphosphate to prevent corrosion in plumbing pipes.

Mine comes off the tap at about 8.5. I'm using aquasoil, and injecting CO2 so my ph gets down fairly acidic. After a water change it's alkaline and drops to acidic over a few days. PH swing is not a big deal for fish really.

You could either do a little R/O and dilute it or get some AS inject CO2 and see where the water balances and work from there. Perhaps add some peat to your filter. I just put a couple tablespoons in a panyhose.

I wouldn't worry about it much. I'm unsure it plants gobble up the buffer, or if a phosphate absorbant would deal with it. I hardly test anything anymore.
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post #3 of 6 (permalink) Old 11-12-2007, 04:29 AM
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Oh to answer you CO2 question. I just did the fish gasp method heh. When you are chillin on Sunday just inch it up slowly every hour or so. When the fish head for the surface, crank it down a few BPS. ::shrug::
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post #4 of 6 (permalink) Old 11-12-2007, 05:03 AM
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You could filter with peat. That'll lower your pH and KH all at once, although 5 is already pretty darn low!

I don't think plants are all that sensitive to pH, I can't imagine it being the biggest problem you encounter.
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post #5 of 6 (permalink) Old 11-13-2007, 03:37 AM
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high PH...

Mix with RO, Filter with peat, and add acid like
Hagen PH Adjust

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post #6 of 6 (permalink) Old 11-13-2007, 08:54 AM
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I'd recommend against using pH adjust and other buffers, hard to stabilize.

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