November 2012 - Parks & Recreation - 53

Gaithersburg Water
Park, Maryland

system for the splash pad anticipates
likely recommendations coming from
CDC in the MAHC.
" There is a very, very strong recommendation that any pool that has, in
essence, agitated water where there is
high potential for kids in swim diapers
or incontinent children in the water,
that those bodies of water have a mandatory UV or ozone as a supplemental
disinfection process to the chlorine, "
says Robert Kappel, regional sales manager for Prominent Fluid Controls. " If
the CDC comes out with some regulations like that, most of the time states
just adopt it in whole because then they
have the cover of a federal agency. "

Variable Frequency for
Variable Loads
In contrast to Gaithersburg's high bather loads, Jim King, swimming pool
technical supervisor for the Los Angeles Uniﬁed School District in California,

is faced with very intermittent loads at
some of the high school competition
pools he manages.
" We have gone with variable frequency drives on our motors, " King says.
" Basically it just modulates the speed
of the motor....You get longer cycles
between backwashings, which saves
you water. You also can run the motor
slower when the ﬁlter is clean so it saves
you a lot of money...and also it's programmed in to slow down at night too. "
King estimates a 25 percent energy
savings at his pools where the VFDs
have been installed. Kappel notes that
VFDs have the potential to save large
aquatics facilities up to $50,000 per year
in electrical energy costs, as long as the
local health department allows changes
in ﬂow rates.
" That's not a drop in the bucket-
that's meaningful money. You can see
the return on your investment in less
than a year, " Kappel adds.

Dennis Berkshire, director of client
services for Aquatic Design Group,
an architectural and engineering design ﬁrm for commercial pools, notes
that facilities should consider not only
the lost water, but the lost heat when
backwashing.
" If you clean a ﬁlter system and backwash 5,000 gallons of water out of a
pool, that's 5,000 gallons worth of heat
and balance chemicals that are lost as
well, " Berkshire says.
The L.A. school system has also invested in new, more efficient boilers to
save on natural gas costs. And the new
boilers feature self-diagnostic systems
that shut the boiler down if it gets too
hot-a crucial feature in an era of reduced preventative maintenance budgets, King says.

From Integrated Systems
to Mobile Apps
Perhaps the greatest combination of

WWW.NRPA.ORG | NOVEMBER 2012 |

Parks & Recreation

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November 2012 - Parks & Recreation

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