What in my youth was a common occurance in the "old contry" has it's depute in the US and ddoes not need Swimming Pool Chemicals. We found this article in:Mother Earth News: Natural Swimming Poolshttp://www.motherearthnews.com/article/2075/toparticles
Whether you like to practice your dolphin dives or lounge away the day on a raft, swimming is one of summer's perfect pleasures.With a minimum of materials and without an arsenal of chemicals, you can build an idyllic water oasis right in your own back yard and thwart summertime's sultry dog days.Though fairly common in Europe, natural swimming pools (like the one pictured above in an Austrian family's back yard), are in their infancy in the United States.Ask most American swimming-pool contractors to build a backyard pool and chances are they'll roll out a long list of goods, including rebar, gunite, fiberglass, chlorine and an energy-sapping filtration system.But in recent years, a few builders and a growing number of homeowners have learned how to build pools without relying on a mass of manufactured materials and chemical additives.They've found it's possible to construct pools that are more about building with nature and blending into the natural landscape.Natural swimming pools use gravel, stone and clay in place of concrete or fiberglass, and aquatic plants instead of harmful chemicals and complicated mechanical filtering systems.The plants enrich the pool with oxygen, support beneficial bacteria that consume debris and potentially harmful organisms, and give habitat to frogs, dragonflies and other water life.The result is a beautiful, ecologically diverse system that is relatively inexpensive to construct.(A natural pool can be constructed for as little as $2,000 if you do it yourself, while conventional pools can cost tens of thousands of dollars.)Natural swimming pools require no harmful chemicals, are fairly low-tech, and once established call for only a modicum of management.You won't have to drain the pool each autumn.While it's true aquatic plants do not remove all contaminants from the water - and pools constructed of dirt, concrete or rubber liners don't necessarily keep bacteria at bay - the probability for contracting a serious disease from your natural swimming pool is low.You can make your pool as shallow or as deep as you want, but the key is to make sure the sides slope: Otherwise the soil will cave in.One of the main reasons traditional swimming pools are constructed with a steel framework is to ensure the walls stay vertical and perpendicular to the bottom surface of the pool.Reserving at least 50 percent of your pool's surface area for shallow plants, either at one end or in a ring around the sides, eliminates the need for chlorine and expensive filters and pumps.Rushes, sedges and water lilies not only provide a beautiful border around your natural pool, but the keep the water clear and clean.Establish you plant beds around the outside perimeter to naturally filter and clean your pool.A rim within an inch of the water's surface keeps plants in their place but allows water from the swimming area to move to the plant zone for filtering.As water passes through the fibrous root structure of the plants, bacteria concentrated on the plants' roots act as a biological filter, removing contaminants and excess nutrients in the water.Inside the plant zone, the water should get steadily deeper, reaching a maximum depth of 18 inches near the swimming zone.Water can be channeled from your pump into your plant zone through the use of PVC tubes.Place your aerator, pump and skimmer in a plastic container, such as a bucket or large plant container, and put a steel-mesh filter mat over the top, to keep debris out of your equipment.Once you've dug the hole for the swimming pool and the plant zone, you have a couple of options, depending on your soil conditions, to make sure the pool holds water: You can apply a layer of bentonite clay to seal the soil or lay a synthetic liner.Liners can cost 25 cents to $1 per square foot, depending on their composition and weight.Some soils may contain enough clay that simply compacting the pond bottom will enable it to hold water.In arid climates, Zingaro recommends bentonite be applied beneath a plastic liner that is woven or textured on the bottom.Before treating your pool with bentonite or any other clay powder, thoroughly compact the soil.In water 6 to 18 inches deep, plant a mix of floating, submergent and emergent plants.Water lilies (Nymphaea) adapt to any depth, so use them liberally.Floaters, such as pondweeds (Potamogeton) and common duckweed (Lemna minor), drift freely on the surface and quickly cover the surface of the plant zone.Before you make plans to tromp off to the nearest country pond and gather up a truckload of greenery, wait!Before collecting a single plant from the wild, know the laws protecting wetlands and their plants.If you do collect, be careful to guarantee the health of the wetland by selecting only a few samples from larger populations.Consider rescuing plants from a threatened site.Perhaps a new corporate headquarter's construction is going to destroy your favorite frog hollow.Contact the company to see if it will allow you to rescue the imperiled plants and maybe a few amphibians.Once you've purchased your plants, you can plant them in the filled pool.Stick to a plan, grouping plants according to height and type.Place your plants into the soil, anchoring them with plenty of gravel.Pond owners have been battling algae - the mighty green menace - for eons.Algae compete with plants for nutrients and light, but spring algae blooms often decline as soon as water lilies and other plants emerge to shade the water.Promote plant growth and deter algae by adding plants and eliminating phosphorous to maintain a lower pH (5.5 to 6.5).The easiest remedy, and the least risky to your aquatic ecosystem, is to add more plants, which will outcompete the algae for nutrients.A second option is to monitor the pool for phosphorus.Fertilizers and urine are the two major sources of this nutrient, so make sure your pool is free of nutrient-rich runoff and remind everyone to use the bathroom before swimming.You can also increase your aeration schedule to stimulate more biological activity.If algae problems persist, adding small amounts of straw to the pool will help.For full details, visit the Institute of Arable Crops Research Web site at www.iacr.bbsrc.ac.uk/pie.Go to the Center for Aquatic Plant Management link and download "Control of Algae Using Straw."For barley straw sources, go to www.ianr.unl.edu/pubs/wildlife/nf429.htm or www.naturalsolutionsetc.com.Enzymes, bacteria, acids and other strange brews have been offered as magic bullets for obstinate algae.Introducing additives to your pool may be an interesting scientific experiment, but it won't necessarily improve the pool you've invested plenty of time and money in.Inexpensive test kits, available in garden centers, will allow you to monitor your pool's nutrient levels, alerting you to problems.Environmental writer and educator Douglas Buege is an avid organic gardener and beekeeper.Freelance writer and editor Vicky Uhland has written about holistic lifestyles for a variety of publications.
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