水草情迷

我始終覺得用樹脂控制kh,再用co2控制ph最好

我認為peat fibre 是很好的一個降ph公具 , 而且對水質影響最少, 比較天然, 不過用前請記緊清洗或煲佢一陣

我記得種蘭花的材料，如水苔，蛇木屑，芒骨，用久了好似會變酸，唔知將佢地放落水得唔得？有冇朋友試過？

掂！剛剛做左個小實驗，D水原本PH 8.3, 一加左水苔，3分鐘後 PH drop 到 6.4, 大家可以試下玩！（水苔$20 一大包）

過了好久了,偶然在aquabotanic看到這個,忽然又想到之前的這一個疑點,白醋只是短期的降低pH,長期性卻會提高pH:

"White vinegar to lower pH?
posted Wed August 20 2003 12:30 PM

I haven't used it, and I wouldn't use it. There's at least one detrimental side effect to using vinegar (acetic acid) and there are several alternatives.

I have to ask, what is your pH, why is it higher than you want and why do you want it lower?

Acetic acid is excellent bacteria food. Bacteria in your tank and filter will convert it to some form of inorganic carbon. When that happens the bacteria will use oxygen and increase the oxygen demand on the tank. At the same time the acidifying effect from the vinegar will go away. If the bacteria work fast then the problems will be noticable. Otherwise all you see is that the vinegar effect disappears.

I'm not sure that the bacteria will produce just CO2. The acetic acid in the vinegar contains a negative electrical charge, so to preserve the charge balance I expect that the bacteria will produce one mole of CO2 and one mole of HCO3- (bicarbonate) from each mole of acetic acid in the vinegar. In that case, the CO2 will be used or escape, leaving you with the bicarb. Bicarb is KH; producing bicarb increases KH and that causes the pH to be higher than it was to start with. So you might get a short-term decline in pH but a long term increase in pH.

If you do add acetic acid then you will not be able to measure CO2. Acetic acid is a non-carbonate buffer and will change the readings from CO2 kits and from the KH/pH method.

If you want to lower pH in a planted tank then the first course is to increase the CO2. If you have as much CO2 in the tank as you want or can get, then you look to other ways of getting the pH down.

If you don't want to add CO2 then the best way to lower pH is to add water -- distilled, deionized water. If you mix your water with an equal volume of distilled water then (all else being the same) you will knock 0.3 off the pH. Larger proportions of distilled water will give you bigger changes in pH.

If CO2 and dilution don't do it for you, then the last way to lower pH is to lower KH by adding a strong acid. Hydrochloric (muriatic) acid or sulfuric acid are the most likely choices. Either one must be handled with care. "


Roger Miller

http://aquabotanicwetthumb.infopop.cc/6 ... 1126099204

有冇人聽過一葉荼，據聞可以醫治血酸過高的病，早前返大陸買了一小盒，一枝荼葉可以沖一公升水飲用。
小弟亦做了一個實驗，開始時用一公升水放在膠容器中，並測試PH值=8.1，再把一葉荼(2枝)放在水中，結果如下：

PH=8.1 (Begin) ,
PH=7.8(2hr後)，
PH=7.4(2hr後)，
PH=7.2(6hr後)，
PH=6.5(12hr後)，
PH=6.5(2日後)......一星期後冇孌 PH=6.5。
之後把一半水倒去後，再補充一半的水，開始時PH大約=7.8，四小時侯又回落6.5，不過水Ｄ顏色就好似某隻"呀媽信／黑水"。
唔知道"呀媽信／黑水"係唔係這樣製造出嚟泥 ? 講笑。

我还是建议你使用榄仁叶，使用很简单，放到缸里后就万事OK了，不仅可以降低PH，还可以营造出极具热带水域风格的景象，一举两得。象我在北京，北方的水碱性很强的，榄仁叶都可以帮忙解决的！！

磷酸之外
是否還有什麼錯合酸可以使用嗎？
最好是化工材料行有賣的。

put a piece of apple to hte water (not kidding)

請問你用邊隻樹脂down kh呀，我都好想搵平o既氫型軟水樹脂呀!!唔該!!

加Ada的黑泥

market 上都有些叫pH調低劑可用

磷酸二氢钾可以快速降算，但是会有褐藻产生！

磷酸二氢钾+几条淸苔鼠