OK, not sure of the units sallyann has been given. A value of 37.1 would seem to refer to hardness in mg/L units possibly (but whether carbonate hardness or general hardness we don't know.) The generality she's been given doesn't fit. A value of 37.1 would translate to 2 degrees of German carbonate hardness, which would place it in the "extremely soft" category on most people's scales. Each German degree is 17.9mg/L of concentration.
Thats why I asked for the link, not quite sure what the water company mean.
If the 37.1 indeed represents mg/L of carbonate hardness, then that would fit perfectly with the sudden pH swings, as 2dgH just isn't going to buffer pH hardly at all. All of this is academic probably. I leave it to you MW to decide whether to recommend any actions. The usual tools for buffering are 1 teaspoon of Sodium Bicarbonate (pure kitchen baking soda) per 50 litres of water to start, then remeasure KH and see if you want more. KH=5 will hold pH stable for a week or so generally and baking soda acts quite fast so can be helpful in fishless. The slower acting, better for fish, tool is to put a very small part of a handful of crushed coral into a mesh pouch in the filter and watch it raise KH and pH after about a week or two, or in her case since pH is already up there, it probably wouldn't raise it more, but would probably protect against the drops.
yes if anything a small handful of crushed coral would be my recommendation. however weather that's necessary or not i'm not sure.
sallyanne do you know if the pH continues to drop over time if left or if it stabilises at a certain level? if you don't know and feel like doing a little experiment then get a glass of tap wateer, stick it on the windowsill or something and test it daily, see if the pH just keeps falling or at what point it becomes stable.
ps. Yes, you have to watch out for me as I am easily entertained by what I consider the fascinating little science stuff and will go on about it whether it is really needed or not! And always important to remember that I'm mostly just a good "scribe" and have not yet "re-earned my stripes" as a modern experienced fishkeeper!
ha ha you do, but I think it's good. This is certainly not the first time you've got me thinking about something sciency that I probably would not otherwise have considered. Were it not for people like you always wanting to know 'why' and pushing back the boundaries we'd all still be sat in caves.
you do yourself a dis-service though, you may not have been keeping fish all that long (2nd time around anyway........ in fact as you don't actually have any fish yet can you say you've kept fish in the modern way at all!??) but you're advice is generally spot on, well thought out and well written. what more could you want?!
The link is www.yorkshirewater.com
Don't know how to post the page on this web site, anyway if you got to that page, and type in your postcode, it will give you the water hardness, their is a converter on that page too, if any of you Science buffs want to have a look!
The ph, starts off high, then seems to stay at 7.4, after about 3 days, would be interesting to test the water again in a weeks time to see what the ph is though.
Heavy stuff this ph business!! LOL!