水草情迷

睇到D鋪頭門口個水草缸內，有樽軟水樹脂

reference
http://www2.aqugrass.com/phpBB2/viewtop ... ighlight=o

太深o既唔係好識..

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可能我問得太深入，其實我想知道D樹脂點用，同埋幾耐要換？還是係可逆反應，用完可以再用？

I have used Cation resin 陽性樹脂 before, which replace Ca+, Mg+ by Na+ to soft water(reduce GH), but CO3-/SO4- (KH) remained unchanged.

I used a little power head to drive water into a DIY bottle. GH dropped to zero overnight but KH remained unchanged. Hardness rised gradually and resin change color(deeper), then I "recharge" the resin by salt water as instruction.

It work again after recharge but have less performance each time. Even worse, KH become out of control (max. 16dH after a month). Finally I removed it from my tank and plan to replace the substrate(with seashell).

FYI: anion resin 陰性樹脂 can replace CO3-/SO4- by Cl-(reduce KH), but it is recharged by hydrochloric acid, which is corrosive and hameful if not handling well. So I don't use them.

So I don't think you need to use them with good substance unless you are using well/spring water.

Sorry for saying too much, and hope help you some.

thanks!YKK