QUOTE(moorish @ Feb 21 2010, 05:11 PM)
5 degree is more than enuf, you can add a bit to stabilize the dkh, if add more your PH will increase.
har? The current dKH is about 2 only :S i spoke to a few lfs, they all say its ok and wont be a problem since i'm just bare tank and chaning water 20% a week. But i scared cuz everyone say 5dKH is the safe point =.="
Hey i just bought a ph pen today. I did the calibration instructions in the ph.70 solution provided....it calibrated 6.9 instead of the instructed 7 =.="
Any opinions?
Then i proceeded to rinse in tap water which gave a reading of 7.8?!?!
i tested the tap water with my sera ph soln - no way the colors showed anything near that...in fact the color showed somewhere btw ph7 to 7.5 =.="
so after rinsing and shaking it and blotting the bulb looking point end with a bit of tissue to dry it, i put in my aq it showed like ph 7.8 =.="
again i used my sera ph soln test, it showed the color range of ph7 to ph 7.5
hmnn this morning i soaked the ph pen in the ph7 solution for about 30mins....did the calibration and it showed ph6.9 =.= then i pressed read it showed 6.9 then i lifted the pen up and put it back into the ph7 solution and read again it showed ph 7....then i pressed read again...it showed ph 7 and then i read again...again 7...
so ok...
i go to my toilet, make a bucket of danki water (water from water reserve up the house)
i swirl the pen in the bucket for a bit...then press read....the pen shows ph7....i lifted the pen out and put it back in again and press read but gently swirling, showed ph7...
then i went to my aauarium....swirled the pen in there for a bit and then pressed read...
it showed ph7.8
i tried again, still same 7.8
then i lifted the pen up and put in again and move it a bit while reading, again ph7.8
i have a feeling that it may be right that my aq ph is indeed 7.8
but what concerns me is the ph pens accuracy....i mean...last night it showed my denki water to have ph.7.6!!! even after calibrating it several times
This post has been edited by leong2084: Feb 22 2010, 07:21 AM
Feb 21 2010, 09:06 PM

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