产品名称：BypassSandfilterforPoolWatertreatment

When to Consider Sidestream Filters

The installation of a sidestream filter is a capital expense, which may be hard to justify in most plants. Consider the following as indications that a plant should look into the possibility of installing a filter.

1.The primary makeup is from an unclarified water source (river, sewage treatment, etc.) that is high in suspended solids and/or iron.

2.The system is having a difficult biological problem even though a good biocide program is in effect.

3.Heat exchangers are opening dirty even though a good antifoulant program is being used.

4.Excessive corrosion rates can be traced to fouling.

5.Loss of heat transfer is attributed to deposition rather than corrosion.

6.High levels of solids are building up in the sump.

7.Heat exchangers require frequent mechanical cleanings.

As stated, these are indicative only. By identifying potential threats to your systems and solutions to those threats, you can determine the paybacks of installing a sidestream filtration system. Often the payback is less time than you would think. This will vary widely from system to system; the final decision will always rest with a plant, and will always be decided on economic grounds.

Sidestream Filter Benefits

Once a problem has been recognized, several benefits can result from the use of a sidestream filter. Obviously, not all of those listed below apply to all systems, and good judgment must be applied before making any claims. However, bearing that in mind, the following benefits can be realized:

1.Since solids are removed from the system, the corrosion inhibitor will lay down its protective film on clean rather than dirty surfaces, thereby reducing corrosion rates and increasing equipment life.

2.When used with good chemical treatment, the filter will keep the system much cleaner, and, as a result, the need for mechanical cleaning of exchangers and sumps is reduced.

3.A cleaner system means better heat-transfer rates for longer periods of time.

4.In some cases, the removal of suspended solids from the circulating water allows higher cycle.

5.Large biological growths and dead organisms are removed with a sidestream filter. This reduces chlorine demand and makes nonoxidizing biocides more effective.

What is a sand filter?

Sand filter is a great water purification equipment which use sand as filter media to remove suspended solids for irrigation water, cooling water, swimming pool water etc.

Sand filters use this simple but very effective method to give you the filtration you need to clean your water. Water enters sand filter and is channeled to the top of the filter and falls on a bed of sand. Filtered water then exits through laterals at the bottom of the filter and the trapped dirt in the sand is removed via periodic backwashing and infrequent sand replacement. This sand filter is easy to install and very simple to maintain.

How do sand filters work? 

1.Filter

The normal setting for the valve. Pool water is drawn through the pump, passed into the top of the filter tank and down through the filter media, via the filter underdrain system, after which it is returned to the swimming pool.

2.Backwash

The setting used for flushing out the filter when it becomes overloaded with dirt. Water is drawn from the pool by the pump and enters the filter through the underdrain system in the bottom of the tank, where it loosens the media bed and forces the trapped dirt upwards and outwards through the distributor in the top of the filtertank and away to waste, so you lose water from the pool. The filter media is retained in the tank. In this position the filtermedium or sand gets washed from the bottom upwards.

3.Rinse

Used to flush out any dirt trapped in the pipelines after backwashing, only required for a shorter period. The water follows the same path as when on “ FILTER” except that the water exits to waste instead of returning to the swimming pool. In this position the filtermedium or sand gets washed from the top downwards.

4.Bypass

Allows pump to circulate pool water without passing it through filter tank. Allows the heating and chemical dosing equipment to remain in use if filter tank is out of operation or when a chemical need to be mixed into the pool water without entering the filter.

5.Waste

Runs water from pool direct to the drain. Used when lowering pool water level, such as after heavy rain or when vacuuming a heavily contaminated pool without overloading the filter media bed.

6.Closed

Use this only when the pump is switched off. This position is used where filtration equipment is sited below pool water level. Allows pump lid to be removed and pump basket to be cleaned, provided that all pump suction valves are also shut off.

Specification:

Application:

The Multigrade sand filter is an ideal choice for all applications where a conventional sand filter is used.

 It is extensively used in side stream filtration of cooling water.

 Drinking Water.

 It is ideal for filtration of clarified water.

 Water used in chemical processes.

 Filtration process in Industries.

 Used for pre – treatment for membrane systems.

 Swimming Pool Water Filtration.

 Filtration in Tertiary waste water treatment.

 Pharmaceutical Production processes.

FAQ:

 01.  how small a solid needs to be removed,

02.  how dirty the water is,

03.  how the water will be used once it is filtered,

04.  and the source of backwash water needed to clean the filters.