Yes, some water supplies can be very high in Ca. We have had a few on the chem forum with
this issue/problem

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"William Marsh" wrote in message
...
: Hi Miskairal: We have on part of town here in Ks that the city water comes
: from a lake that must have a high calcium concentration. People there never
: add Calcium to there tanks it comes with water changes. maybe that is why
: your calcium is so high. lucky you.
: Bill
: "miskairal" wrote in message
: ...
: Does the Ca get released into the tank?
: I'm the one with the Ca reading of 600 while using NO additives. Not that
: I imagine that will last once I get more corals.
:
: Thanks Wayne
:
:
:
: Wayne Sallee wrote:
: Volcanic rock is very porus, but it has nothing else to offer. Best to
: stick with light weight calcium based rock.
:
: Wayne Sallee
: Wayne's Pets
:
:
:
: miskairal wrote on 3/16/2006 5:15 PM:
:
: I'm not a geologist and don't remember much about what I was taught at
: school on the topic but my hubby tells me that over in the far back
: corner of our farm is an area that a geologist told him had been a
: volcano. There is rock there that looks very much like some live rock,
: very porous and open but dark coloured.
:
: I need way more rock in my tank but am happy to add dead rock and wait.
: How can I find out if I could use this stuff? I know there have never
: been chemicals of any sort used over there and the only possibility of
: anything like that contaminating it would have been if cattle were
: dipped for ticks in the yards about a kilometre away and went straight
: there, which they don't, still dripping (not really possible in our dry
: climate).
:
: Cheerio
: miskairal
:
: