Does GH really matter in KH+GH

[anewbie]

We have KH and GH - while there is a well discussed correlation between KH and ph and impact on bacteria types which in terms can impact fish immunity based on the environment they been exposed to - but when we talk about impact to fish metabolism and organs is there a distinction between KH and GH or is the sum KH+GH (tds) sufficient and the decomposition between the two irrelevant.

 

[MacZ]

In extremophile softwater species both can have negative impact on the kidneys and gills. But there are barely any studies. It's just a conclusion from what we know of their physiology.

The composition of the TDS can be very important, e.g. in case of a water softening unit (lowering GH, often by raising KH), but if the water is more or less natural GH and KH have a certain ration to each other (usually roughly 1 KH : 1.5 GH)

That's already all there is to say in my opinion.

 

[anewbie]

In extremophile softwater species both can have negative impact on the kidneys and gills. But there are barely any studies. It's just a conclusion from what we know of their physiology.

The composition of the TDS can be very important, e.g. in case of a water softening unit (lowering GH, often by raising KH), but if the water is more or less natural GH and KH have a certain ration to each other (usually roughly 1 KH : 1.5 GH)

That's already all there is to say in my opinion.

I guess another way of phrasing this if the tds is 30 - do you really care about the split. We can assume 1 to 1.5 but i would think the lower to go the less certain it becomes - though in the end does it really matter if at tds 10 it is 100% kh or 100% gh (and of course gh itself can be a lot of different elements just not carbonate).

 

[MacZ]

At a TDS of 30 we're talking trace amounts basically. Negligible impact.

 

[anewbie]

At a TDS of 30 we're talking trace amounts basically. Negligible impact.

Well it is high enough for kh to be 1.5 or gh to be 1.5 though probably not both

 

[MacZ]

If it was all hardness. Remember, TDS meters just convert EC in TDS and both measure everything dissolved in the water. If it has 30 TDS, it could be just 5-10 of those are comprised of GH and KH together.

 

[anewbie]

I was going to write an answer but i think i will stop since it isn't all that informative so in saving move i will note that the biggest news is no news as tomc website hasn't noted any thing new in over a year.

 

[dw1305]

Hi all,

I guess another way of phrasing this if the tds is 30 - do you really care about the split......

I don't really care, our rainwater is usually about 30 ppm TDS, I assume that is 1: 1 dGH : dKH but I've never checked.

Cheers Darrel