http://www.pentairwatertreatment.com...et%2042749.pdf has specs. 20 GPM continuous at 15 PSI drop. 3/4", 1" or 1-1/4" input and output. However the price difference may be negligible currently.
The chances of your unit channeling is slim to none. This would be more of a problem on larger units. Most of the electronic valve thses days have a day override. So if you set the day override for every 7 days, the system will regen if the gallon count has not reached it's max.
Edit: The 5600 is equivalent to a 3/4" valve internally despite available adapters. Having suffered through inadequate plumbing in my house I resolved that my new installation would present the least restriction possible. So I chose a pair of 7000SXT and 1" type L copper trunk all the way to the bathrooms. The resulting flow rates vindicated these choices.
Last edited by lifespeed; 12-20-2013 at 01:25 PM.
10 GPG is not that bad, but you will benfit from a softener. Also, the cause of scale is a lot more than the hardness. pH, temperatures, etc... all affect the scaling potential of water. I have fouled up membranes with scale in as little as 2 GPG of hardness. Steam boilers require <5 ppm of hardness, etc.
Here is a great article explaining the low levels of hardness and their affects in a simple way. http://www.wcponline.com/pdf/1203Michaud.pdf
100% agree on this. Peak flow rates of systems are almost always very conservatively stated, and exceeding the SFR on a very rare occassion has almost no affect on a softeners longevity in a residential application. Of course, if you are constantly exceeding the systems design parameters, you will cause pre-mature damage to the media, but residentially, where the SFR may be exceeded very intermitently, and for very limited amounts of time...
Day over-rides are nice, but for residential applications, I set them to 30 days. Small systems and tanks do not channel under normal conditions. It is the very large tnaks that tend to have issues due to low flow across too large of a bed area.
Hope this helps.
The odds are... my customers do not exceed the constant SFR gpm I told them to expect because they look in the history of their Clack control valve to see the max gpm that has been run through their softener. I have yet to have any of them find I was wrong, although some get real close to going over it, and I ask them to look and I ask if they think the softener has always given them 0 gpg soft water. Without running low or out of salt, they always say yes.
I have never sized based on all fixtures' max gpm as if all fixtures were running at once. But plumbing codes do call for that. I size based on the type of fixtures and how many bathrooms and the number and ages of the people living in the house and how they use water. IOWs, real world water use.
Using a bucket etc. to try to determine flow rate means you have to run all the fixtures into buckets at the same time, you can't physically measure it by running one at a time. All fixtures but tubs and toilets have a federal government max flow rate; that's the numbers I mentioned previously and will be your peak demand.
The Pentair flow rate figures are for their control valve, not an entire softener.... If you go to any resin manufacturers' web site and look up the SFR on their resins you will normally see a range of 1-5 gpm per cu ft.
My figure of 9 gpm constant SFR for a 1.0 cuft softener is all but twice their figure so I don't see that as a conservative figure. The SFR of a control valve is to be used to determine IF that control valve can service the size tank being used, and the cuft volume of resin dictates the size of the tank and that dictates the control valve that can be used. Example, a 5600 can be used for up to a 12" dia tank for a softener (2.0 cuft) and up to a 10" dia tank for a filter (1.5 cuft). The valve speck sheet also shows the pressure losses at X continuous and peak gpm and that is mostly used to compare one valve to another. Many people mistakenly think otherwise but, I would like to know how anyone can size for constant SFR 99% of the time.... And if you can do that, I have to ask why not 100% of the time? That's like saying that removing all but 2-3 gpg of the hardness is OK. Or with a filter, to not get all the H2S or all the iron out is OK.
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