My GEX soil - mix of green and red - is still buffering the water at 6.8 or so, this is even with the presence of Sudo sand in my tank. That said, my pH pen says the pH is 5.7 so either my drip tester or my pen is bonkers.
Tap water supply for me is pH 7.2, GH 3, KH 3 so it's a little alkaline but all good. However, my tank has GH 1 and KH 1 I think.
All in, you should never rely on the soil to buffer your water. Over time as it loses it's efficiency, you will still need to use other methods to keep the water at the parameters you are aiming for, or re-do the whole tank over again.
chansl, sorry to hear that. Is the soil in question by UP brand? Like this:
http://www.up-aqua.com/00-dm-page/up...and-DM-big.jpg
The shopkeeper should not have offered you that soil if you had other products in mind, unless he uses it himself in the display tanks, or has personal experience with it.
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