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RO Water or not
(17-07-2019, 04:23 PM)Baddams Wrote: 'Baddams that's interesting always been lead to believe that a 10 deg shift in temp can affect fish a lot'

Yeah, I'm sure it does.
I've got a 240l with a fair depth of sand substrate and some hefty granite cobbles.
I'm changing about 90l at a time, which is probably around 50% actual water volume.

Given that our tap water at this time of year isn't exactly freezing, I'm only seeing a 2 or 3 degree change in the temperature immediately after I've topped it back up. I'm assuming that the sand/stones are retaining (and then emitting) enough heat from before the change to minimise the temperature shift.*

*Note: I am not a qualified Physicist.
Yeah i would agree with you heat will be retained by everything in the tank at the temp your tank is set to, its also handy that your tap water stays warmish during the summer months, generally icy cold most the year where i live never more than around 14-16 deg.  Quite content now to try mixing with tap water as it will still keep my hardness hopefully down to what i am looking for and can use my tap water to hopefully bring the temps up.  Will find out in October when i have moved my wife keeps saying i am like a kid waiting for my birthday "is it now"  Big Grin
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Where are you moving to? I'm in Bournemouth and all our water is abstracted from a couple of local rivers and treated/distributed straight away (no boreholes or reservoirs). The catchment of those water courses mean that my water's spent 800 years percolating down from Salisbury Plain before it comes out of my tap. As you say, liquid rock.

The tap temperature only varies from the river temperature by a degree or so all through the abstraction/treatment/distribution cycle - it's done that quickly - so it's freezing in winter, tepid in summer.
Interestingly, my local water company* are switching their final disinfection over from chlorination to UV, so I shouldn't need to condition it as much.

*Note: I worked there for a fair few years.
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Fun enough i am moving right next to Salisbury plain near Andover not 100% sure were Veolia get there water from there a little tight lipped when it comes to getting info off them. like i said previous i lived in the area for about 12 years before shifting due to work but am heading back down hopefully using RO this time will mitigate some of the issues i had previously.
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