Bob999
Reporter
Actually the figures were verified and then published. And I cite those figures.
Previously you have said you don't believe my figures and would use the resin manufactures' figures of 1-5 gpm/cuft. If you know anything about peak demand flow rates of houses, or how to calculate it, it is based on the number of fixtures and the type of those fixtures. If you had a peak demand of say 12 gpm for a 2.5 bathroom house with no big tub and one regular shower head in the showers, you would have to size a softener for that house at 3 cuft, right? How many 3.0 cuft softeners do you think are in that size house?
Gary, as I said, until you provide the citation I will continue to believe you made them up. As to my posts about resin manufacturers specifications I recall what I said a bit differently but that is not really the point. The point is that you posted that: "The 1.5 cuft of resin has a 12 gpm SFR, exceed the 12 gpm and the resin can't remove all the hardness." You also posted: "The resin won't remove all the hardness when the constant SFR gpm of the volume of resin is exceeded."
My concern is that these statement are misleading.
As as been discussed in other threads the specifications for Purolite standard high capacity resin provide leakage data at 5 gpm per cubic foot of resin and even at a flow rate of 5 gpm there is hardness leakage--the resin doesn't remove all the hardness at a flow rate of 5 gpm. At higher flow rates/cubic foot hardness leakage increases.
My concern aside I am seeking the basis for your specific quantification of the flow rates that will produce acceptable water quality in a residential setting. Also as has been discussed in other threads the objective in a typical residential application is not to remove all the hardness. The WQA rates water with less than 1 grain per gallon as "soft" even though it still contains some hardness.
In the current thread we are discussing a 1.5 cubic foot softener and the max flow through the softener that can occur and still provide acceptable water quality. I think there is total agreement that flows greater than 5 gpm per cubic foot of resin can occur and still produce less than 1 grain of hardness.
You are posting that if the flow exceeds 8 gpm per cubic foot of resin then "the resin can't remove all the hardness". I think what you really mean is that the water will have hardness greater than 1 grain per gallon. You have, in other threads said that the volume of resin is what determines the "SFR". You also say for a 1 cubic foot softener the SFR is 9 gpm but then you assert that the SFT for a 1.5 cubic foot softner is 12 gpm (and this equals 8 gpm/cubic foot of resin).
So it is the inconsistencies that cause me to again ask for the source of the data you continually assert. I agree that flow rates of greater than 5 gpm/cubic foot of resin will provide acceptable water quality in a residential setting but I am unaware of data that provides a basis for saying any specific number is the cut off such as you are asserting.