Michael Hilleary’s industrial-design education initially led him
to a job designing zoo exhibits. Once, he fashioned an exhibit with clear,
clean, chemical-free water for otters to play. It gave him an idea.
the animals enjoy swimming, I began to think about how people could enjoy the
same quality of water,” Hilleary says. From that, Total Habitat of Lawrence,
Kansas, was born and Hilleary has been offering chemical-free swimming pools
Anthony Archer-Wills, owner of Anthony Archer-Wills, LLC out of
Copake Falls, New York, started building ponds in 1963 for his own amusement. “These were for fish and aquatic
plants, both of which I found fascinating.” His goal was to achieve
crystal-clear water, for which he started experimenting with plants and under
By 1980, Archer-Wills transitioned into natural swimming pools as
a result of customer demand, occasionally getting requests for a completely
natural swimming pond because of allergies to typical pool chemicals. “It was a logical progression to
use the methods developed purifying water for fish to adapt this for people,”
While writing a research paper on sustainable
alternatives to chemically treated swimming pools, Alan Weene came across
BioNova Natural Pools in Chester, New Jersey. After spending most of his life
somehow connected to swimming pools — whether as a swim instructor, lifeguard
or certified pool operator — Weene joined BioNova in 2012 as its chief
technology officer, designer and head of marketing. He frequently conducts
educational seminars for homeowners and industry professionals on natural
swimming pool technology.
The 411 on Natural Pools “A natural pool is like an aquarium,” Hilleary says, “but with bigger filters and a sustainable design. We clean water like nature has been doing for a few billion years,” through gravel beds and/or aquatic plants to purify the water through the production of beneficial microbes.
The initial cost of a natural pool is higher than a traditional
pool, Archer-Wills says, so it can take a few years before it is offset by the
savings on chemicals. They also take up more space because of the natural
vegetation required to sustain the proper ecosystem.
first couple of years, an NSP might experience some ‘growing pains’ as the
ecosystem continues to stabilize,” Weene says. “The appearance of filamentous algae and changes in water clarity
are completely normal and should be expected, and some replanting may be
necessary in spring after the first or second year of operation. But the
constructed wetlands ecosystem becomes increasingly stable over time.”
The NSP approach could be beneficial in a number of ways. As
Archer-Wills mentioned, they cost less to run than traditionally constructed
pools with a smaller pump and no chemicals to buy. This also means that they
are environmentally responsible, with a sizably smaller carbon footprint
associated with usage. Weene emphasizes the promotion of biodiversity and
habitat restoration. And both agree the swimming experience is greatly enhanced
with design, which is only limited by the imagination.
Natural pools can even withstand a little neglect. Day-to-day
maintenance, Weene says, includes skimming leaves from the surface of the
water, brushing the floor and walls, checking the filter, using the pool
cleaning robot and cleaning the skimmer baskets — just as with traditional
pools. “The big difference is
that, instead of testing and balancing pool chemicals, about the same amount of
time will be spent maintaining the plants by trimming, pruning, weeding,
removing organic debris and fertilizing as needed.”
While winterization may be required in locations with colder
temperatures, Hilleary mentions that NSP owners in these areas can leave it
uncovered for the winter and use it for ice skating.
Natural Pool Construction If you’re looking into NSPs, remember that because they are specifically designed, engineered and permitted as swimming pools, they are also subject to all building codes and regulations that relate to safety, accessibility, electrical bonding, anti-vortex drain compliance, diving envelope and the like, Weene says.
A top priority with construction is the ability to adequately
retain water, Archer-Wills says. “Constant
heavy water loss can lead to an influx of salts, minerals, nutrients and even
pollutants, all of which can feed algae and lead to cloudy or unpleasant
water.” He adds that faulty construction is typically to blame, including edge
detail. “Capillary action can
cause water to be sucked out over the side where porous surfaces come in
contact with both land and water,” Archer-Wills says.
swimming pool is always completely closed-loop and contained with a
waterproofing membrane, such as PoolHide 60 mil PVC membrane or gunite with an
interior plaster finish,” Weene explains. The swimming area must have a
physical separation from the wetlands regeneration zone. “This can be accomplished with an
underwater retaining wall in a single-chamber design, or by constructing the
pool and regeneration zone or zones in completely autonomous vessels that are
physically separated by the landscape or by a change in elevation,” he adds.
Because of the natural development of microbes to clean the
water, Hilleary says natural pools often have slick surfaces, so you should
avoid putting steps in the design, and instead use ladders and walk-in pebble
beaches for access.
And Archer-Wills says the bio-filtration area should be as large
as possible. “Apart from the
water passing gently through the gravel beds, the aquatic plants are of great
importance,” he adds. “A lush planting of gorgeous
emergent plants together with water lilies not only play a crucial part in
cleaning the water, but also look beautiful and greatly enhance the bathing
experience and surroundings.”
Weene recommends all natural swimming pools follow the European
FLL Guidelines for construction of natural bathing waters. “For the system to be successful, the
filtration equipment, substrates and aggregates, source water, material
selection, aquatic plants, pumps, hydraulics and flow rates must all be very
carefully evaluated and selected,” he says. He also recommends builders align
themselves with a proven and patented systems provider to ensure the quality,
consistency, longevity and sustainability of installation.
Natural Pool Sustainability A natural swimming pool is a biologically active living ecosystem. But that doesn’t mean it is without maintenance or that it’s completely self-sustaining. Customers and builders alike will need to remain actively involved in maintaining the created ecosystem.
While enzymes aren’t normally necessary, Archer-Wills says they
can be used to regulate the correct biological balance when the NSP is first
established. “Maintenance is
often minimal, however, a cutting back of vegetation and leaf removal in the
autumn is required,” he adds. “Also, a spring check to replace
any plants that may not have survived the winter might be necessary.”
Hilleary and the BioNova system do add a UV sterilizer to the
bio-filtration process. “We
also use starter bacteria to get things rolling, but as time goes on, natural
pools need little additional treatments,” he says. “Giving the pool a good vacuuming two or
three times a year is a terrific way to stay on top of things. In natural
pools, we are trying to grow a rich micro biome, so as times goes by, natural
pools work better.”
Should you offer natural pools? With the differences between a traditional swimming pool and a natural swimming pool in mind, these NSP experts agree that most any pool builder can offer natural pools to their customers. “Any professional who has the knowledge, resource and experience to build a traditional chemical pool can also build a natural swimming pool,” Weene says. “The physical construction of the pool vessel is the same, it’s ‘what’s under the hood’ that makes a NSP uniquely different from traditional pools.”
a glorified aquarium with gravel filter and plants,” Archer-Wills says. “However, there are many aspects to
it that require a thorough understanding. I would recommend a training class
from one of the well-credited instructors such as Genesis or BioNova.”
BioNova does offer training and support for the design,
construction, aesthetics and maintenance of NSPs, including multiple classroom
and jobsite training programs in the U.S. throughout the year. Additionally
Total Habitat has an e-book available called Natural Pools & Ponds: THE
TOTAL GUIDE. “It’s a complete
how-to manual with theory, methods, illustrations and drawings,” Hilleary says.
“We have not held anything
back — all our company secrets are revealed.” Total Habitat also offers
training events periodically.
While natural swimming pools are certainly a niche
market, they offer an alternative to traditional chemical pools for potential
customers who prioritize a natural lifestyle. “Pool builders can think of NSPs as yet another
option for clients looking for a water feature, too,” Hilleary says. “It’s a different experience, where you can swim
with your fish.”