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
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
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
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
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?