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Posted by Jonsey on January 16, 2002 at 20:12:06:
In Reply to: Re: Oil guns posted by Harold Kestenholz - Hydronic Network on December 30, 2001 at 20:12:18:
As a rule, the minimum changing should be daily.
Although each installation is different, and you have to make a judgement call on this.
It may be as often as every 4 hours
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