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3.1.2
Variable refill function
The Foleo softener series is designed to feature a variable refill for each regeneration. This is
meant to optimize the salt consumption of the water softener and allow yearly salt savings up to
30% average* for the same volume of softened water therefore reducing the cost as well as the
environmental impact of discharging salt to the drain.
How does this work:
The Foleo series feature volumetric delayed regeneration, with variable reserve meaning that the
controller will plan the regeneration before complete capacity depletion based on registered
water usage. Therefore when the regeneration is initiated, the capacity is actually not totally
depleted. The XTR controller will take into account the capacity that was really used and will refill
the brine tank so that only what has been used for real is regenerated. The refill time is
automatically calculated by the controller at each regeneration, using the BLFC rate programmed
in the electronic (0.5 gpm for Foleo).
After the variable refill is performed, the softener will return to service for the programmed
duration of the Pause cycle (0-240 min). This time is used to allow refilled water to dissolve salt
and become saturated brine. Be sure to program a sufficient duration according to your local
conditions and salt type.
For best performance prefer to set up a regeneration time where there is low to no water
consumption.
Should the softener be subject to 24/24h water production, the optional installation of the
Pentair® fast brine valve is required so that this pause cycle duration can be reduced to 3
minutes. Contact your supplier for more information.
As an example, assuming the XTR has calculated a variable reserve to 20% of the initial full
capacity based on registered water consumptions, then the XTR will calculate a refill time so that
only 80% of the total theoretical brine quantity is produced, saving therefore 20% salt for this
regeneration.
This variable refill function, combined with the upflow regeneration mode of Foleo's series where
brine is injected from bottom to top in a packed resin bed at low velocity is ensuring the best
optimized performances and savings in water softeners segment.
Info
Any manually started regeneration will initiate a regeneration with 100% of the
theoretical brine quantity to produce regardless from the water usage for the current
service cycle. Should a controller initiated regeneration (including remote signal
started regenerations and days override regeneration) start while less than 10% of the
capacity is used, in any case the calculated refill time will correspond to a minimum of
10% of the total theoretical brine quantity.
*Compared to a standard downflow softener with optimized programming and configuration.
Ref. MKT-IM-038 / E - 22.10.2021
Installer manual Foleo 5800 XTR - Description
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