水草情迷

有些綱友說：用喉引水至缸外駁銅喉吹風扇降溫，數天後很多魚死亡！

又有綱友說：銅是超毒，好多殺藻, 殺虫藥都係有銅係入面。

如果家居自來水用銅喉，是否不適宜養魚？

如果家居自來水用銅喉，是否不適宜 drink?
please make sence.

_________________
友朋知所剔，何患少交遊。

雖然係, 但你個比喻唔係好 make sense too

人同魚 對 Cu o既 effect 點比...

乜野都好只要係過左個poison level都係會毒死人既....
http://en.wikipedia.org/wiki/Copper
銅既poison level係幾多尼~?
All copper compounds, unless otherwise known, should be treated as if they were toxic. The metal, when powdered, is a fire hazard. 30g of copper sulfate is potentially lethal in humans. Copper in drinking water at concentrations higher than 1 mg/L can stain clothes and items washed in water. The suggested safe level of copper in drinking water for humans varies depending on the source, but tends to be pegged at 1.5 to 2 mg/L. The DRI Tolerable Upper Intake Level for adults of dietary copper from all sources is 10 mg/day.

用人同魚既重量比你可大約知道幾多銅會毒死d魚,而銅既濃度可以用試劑試出.

我夠知啦... 你唔係認為人對 Cu sensitive 過魚呀

ha~
have I ever say that~?

下?
唔使argue la
你又知你家係用緊銅喉?
你有冇讀cert level chem?
冇乜可能用銅wor
1. 重, 多數喉管都係外掛於大廈外牆，重好就難固定
2. 軟, 硬度都不能承受本身重量, 大廈拱水系統起喉咁長起碼過百米lever arm 咁長好易彎
3. 貴, 用來構造一個供水系統既銅比起同一份量既stainless steel貴多多多聲
4. low corrosive resistance, 唔耐用....

至於人同魚既poison level係幾多都答左都幫唔到 "tklm" la

copper pipe replaced GI pipe for a long time. it can use for a longer time.
http://www.info.gov.hk/wsd/tc/html/othe ... q.htm#tape

1. heavy? heavier than a steel sewage pipe? water pipe say 40mm dia, sewage pipe min 150mm. Both fixed in external wall.

2.soft but supported by bolts, bolt connect with external wall.

3.the copper water supply system is in the building. WSD use DI pipes for water supply. 40mm dia copper pipe dont cost much in construction.

4.much more stable than GI pipes, fresh water ~pH7, nearly no corrosive.
and the copper pipe outer is protected bty plastic lining

_________________
友朋知所剔，何患少交遊。

Most public housing provided by government have been replaced by 銅喉 already.
My home are using 銅喉 as well.
However, note two major difference between the two situations.

1.
Tap Water only go through 銅喉 once.
Water in tank is closed system that pass through 銅喉 many many cycle per days.

2.
Fishes are fishes.
Men are men.

And copper is also poisonous to human. But just only with huge amount.

3.
Most tank is with acidic water that reaact with copper relatively more seriously.
Most tap water in most countries is ph7 or alkaline with high KH, that is relative non-reactive with copper.

copper metal won't react with acid (pls refer to metal reactivity series or electrochemical series)

yup, all heavy metal, including copper is toxic
but it depends on the concentration to determine if it's harmful to fish/human
(so someone will put copper penny/copper pipe in the tank to kill algae, snails, etc)

BUT copper is much more harmful to invertebrates
so if ur shrimps/snails in the tank are ok, ur fish probably are safe from copper

the concentration of copper shouldn't be high enough to cause harm to human beings
(imagine how people would react if they know they're drinking toxic water all day long, as boiling can't remove heavy metal/metal ions)
so i guess the concentration of copper in tap water is not high enough to harm fishes

if u still worry about this
u may use some 新水劑 before you put the tap water into your tank
(as some 新水劑 CLAIMS they can remove heavy metal ions in water)

and if u worry about it vvvvvvvvv much...
.......
........
use a reverse osmosis system~!!

but this is $$$$$$$$$$$$$$$$$$$$$$$$

Thanks for corrections.

15,ahkei
我都好佩服你地lor
又為左argue 而argue
搵咁多資料
答左tklm等於冇答
tklm都唔會放心養魚
最勁既係15一開口就叫人"please make sense"
唔耐煩咪鬼答lor

k-1
先至係答好
幫到tklm放心養魚lor

銅會勁殺硝化菌,養魚至怕