When I first switched to RO, someone here that I trust implicitly explained that a KH under 4 will cause to be unstable... AND there is so much advice regarding a stable pH being more important than the correct pH, so what gives guys? Is pH fine with zero or a very low number for KH? Please enlighten me.
Hi, so I haven't tested my tap water's kh, however I know ammonia Is fairly high.It ultimately depends on the unique ecosystem of the tank in question: (1) some people change large volumes of water on a more frequent basis, limiting the need for the buffering capacity of KH; (2) some tanks are inherently stable with minimal changes in pH, decreasing the need for the buffering capacity of KH.
Increasing KH in a pH-stable tank with a low (or 0) KH is, in effect, providing a solution for a problem that doesn't exist. As for "KH needs to be over 4 or your pH will be unstable", I don't find that to be true. For example, Lucas and Southgate (2012, p. 68) indicates that 50 mg/l alkalinity (equivalent to ~2.8 KH) can provide acceptable buffering capacity in aquaculture.
Another example, closer to home, is that both Tom Barr (the developer of Estimative Index fert dosing) and Edward (the developer of PPS fert dosing) both endorse 0 KH.
That being said, 2-3 KH is fine: my tap water is 3-4 and I don't find any particular overriding need to increase or decrease it.
I didn't realise that KH and PH were so closely linked , I though there was some link, but not much affect on each other.Okay.... so my tap DOES have extremely high nitrates and I have a fantail goldie who alone does not need any help raising nitrates. I should have mentioned my own situation and why I chose to use dosed RO instead of cutting it with my tap. I am certainly not the expert on water chemistry, so... I'm hoping that somebody here can help me with the KH thing.
When I first switched to RO, someone here that I trust implicitly explained that a KH under 4 will cause pH to be unstable... AND there is so much advice regarding a stable pH being more important than the correct pH, so what gives guys? Is pH fine with zero or a very low number for KH? Please enlighten me.
remineralizing content is based on sub and inhabitants, and needs to be assessed by the individual tank itself.
yes, Barr often uses 0kh, however, often it’s in conjunction with a specialized buffering ... wouldn’t say he would advocate 0kh in a substrate or something similar...