There are many types of filters. The pool industry uses three different types of filters to remove particles of dirt and debris from water. Here, we'll look at the ins and outs of one of them--the high-rate sand filter. Those who are new to business it is confusing.
The sand filter, though not complicated, does require some knowledge to work it properly. Many service people don't understand how to operate the multivalued, how much sand to put in the tank or when to backwash.
There are many things to remember. The first thing technicians should know about a sand filter is that it has valves which command certain jobs. For example, when the valve is in "filter mode," the water is directed to the top of the filter and then flows through the sand, trapping debris as it travels to the bottom of the filter and out through the laterals.
Many times it is very effective and those who are dealing in this are getting sufficient. Sand filters use one of two types of valves to accomplish this: a multivalve (which can be top or side mounted) and a side-mounted slide valve (sometimes known as a push-pull valve). A side-mounted model is strictly a two-function valve: filter and backwash modes only. The type of valve used is often dependent on regional differences, but in general, you'll likely find more multivalves because they can also appear on DE filters.
So let's take a closer look at the multivalued. It has several positions, known as modes. These modes often raise questions among technicians as to their proper function. We can start by breaking down the various types. These types can be analyzed in many different was.
For the business dealing you must keep these thing in mind . If you follow these basic guidelines, you'll keep your sand filters in top-notch condition and your customers' pool water sparkling clear.
One of the most common additions to an onsite system is sandfilter. Sandfilters are often divided into two varieties; single pass and recirculating. Shown here are recirculating sandfilters which typically send two-thirds to three-fourths of the wastewater that passes through it back for another trip through the filter. Contrary to popular opinion, engineers are not trying to confuse the contaminants out of the wastewater, even if it does seem that way.
The filter media can consist of sand, peat, foam, fly ash or other media with the appropriate size and uniformity coefficient. The media serves as structure that encourages biological growth and allows the applied effluent to "ooze" slowly through the filter giving the bacteria and other organisms time to digest the "food" (which we consider pollutants) in the wastewater. By passing the effluent through the filter several times, more "food" is eaten by the microbes than would happen with a single pass filter. Recirculating filters generally improve treatment efficiency with organic material (BOD), solids, and pathogens. Depending upon the design, the systems can provide for nitrogen reduction, too.
Probably the two most common questions are what do they cost and what do they look like. The photos here can help show what the systems look like. Our observation is they can range from too ugly for us to want one to attractive enough to wonder when Better Homes and Gardens will come by for photos. Aesthetic qualities are individual and we're sure you can decide for yourself. As you can see recirculating sandfilters come in a variety of designs and there is no single look to the unit.
In terms of cost, prices vary depending on location, availability of sand (or other media), and how engineering and contractor costs. We have observed that initially prices can be steep but over time, as the contractors and engineers become more familiar with the technology, the prices drop. The range of costs we've typically encountered have been from under $5,000 to $15,000. We've seen a few cheaper and a few more expensive but most seem to run around $10,000. In time, we believe that price should drop significantly.
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