Take a look at this:
http://www.ezhottubs.com/news/spa_filth.htm

Marshall

[email protected] wrote:
What is reason for CS in hot tub
In a message dated 1/25/2010 6:17:04 A.M. Central Standard Time, [email protected] writes:

    Told you I could do the math right ... one more time:

    200 cups, 50 quarts, 12+ gallons.  It's early... :-)

    Dick

    ------------------------------------------------------------------------
    *From:* Richard Goodwin <[email protected]>
    *To:* [email protected]
    *Sent:* Mon, January 25, 2010 7:07:38 AM
    *Subject:* Re: CS>CS > OFF TOPIC FIR SAUNAS

    Yow!  1/2 cup of EIS per gallon of hot tub water?

    That would be ... if I do the math right ... for a 400 gallon hot
tub, 200 cups, 40 quarts, 10 gallons of EIS.
    I use it in our hot tub too, but put about 1/2 gallon into it
(approx 400 gallons of hot tub water). It seems to work ok. Water stays clear and sweet, and doesn't create any problems that
    we know of.

    Here's a question:  Is there any good way to test hot tub (or
    other) water for bacteria growth?

    Dick

    ------------------------------------------------------------------------
    *From:* John E. Stevens <[email protected]>
    *To:* [email protected]
    *Sent:* Mon, January 25, 2010 5:02:12 AM
    *Subject:* Re: CS>CS > OFF TOPIC FIR SAUNAS

    Hi, Gayla:

    Thanks, Gayla.  About a 1/2  cup per gallon - or so.  I'm not
    worried about using too much because I know CSW is good for my
    skin, too.  I'm kind of guessing at how much to use because I
    can't find any info on it - so I use what I think is appropriate
    and safe.

    John

    On Sun, Jan 24, 2010 at 8:06 PM, Gayla Roberts <[email protected]
    <mailto:[email protected]>> wrote:

        John very interesting! How much CS do you use per gallon in
        your tub? I have a 2 person SoftTub that I would love to treat
        with CS.
        The house sounds lovely!
        Gayla

            ----- Original Message -----
            *From:* John E. Stevens <mailto:[email protected]>
            *To:* [email protected] <mailto:[email protected]>
            *Sent:* Sunday, January 24, 2010 8:25 AM
            *Subject:* Re: CS>CS > OFF TOPIC FIR SAUNAS

            Lisa:

            My Sunlight Sauna runs off 120 house power.  My total
            total electric and gas bill runs about $143.00 in the
            coldest of NY winters.  Basically because I have a passive
            solar heated home




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