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Did
you know?
Reverse osmosis is the finest water filtration method known. This process will
allow the removal of particles as small as ions from a solution. It is used
to purify water and remove salts and other impurities in order to improve the
color, taste or properties of the fluid. R.O. uses a membrane that is semi-permeable,
allowing the fluid that is being purified to pass through it, while rejecting
other ions and contaminants from passing.
This technology uses a process
known as crossflow to allow the r.o. membrane to continually clean itself. This
is the reason of why an r.o. element can last many years before clogging or
need replacement. This
water purification process requires a driving force to push the fluid through
the membrane, and the most common force is household water pressure or pressure
from a booster pump. The higher the pressure, the larger the driving force and
efficiency.
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How
do they set my water prices?
Many people
often wonder what factors are taken into consideration when your local
water utility or bottled water company sets its price for water. After
all, anything scarce and in demand commands a price; this is one of the
basic principles of economics. Water is scarce in some contexts (drought,
degraded quality), so water pricing is increasingly seen as an acceptable
instrument of public policy. Water-use charges, pollution charges, tradable
permits for water withdrawals or release of specific pollutants, and fines
are all market-based approaches that can contribute to making water more
accessible, healthier and more sustainable over the long term.
For this
reason, countries are working toward the goal of "internalizing" the full
marginal costs (including environment costs) into decisions that affect
water use and water quality. One particular area of water policy that
has become increasingly subject to pricing principles is that of public
water supply and wastewater services. Efficient and effective water pricing
systems provide incentives for efficient water use and for water quality
protection. They also generate funds for necessary infrastructure development
and expansion, and provide a good basis for ensuring that water services
can be provided to all citizens at an affordable price. The metering of
water consumption is a prerequisite for the application of efficient water
pricing policies.
About two-thirds
of some developed countries already meter more than 90% of single-family
houses, although universal metering remains a controversial issue in some
contexts. Selective metering is less controversial, particularly if the
public knows that new water resources are scarce, or if the metering applies
to discretionary water use, like private swimming pools. Metering new
homes is also more widely accepted than converting older ones. Most of
the population still lives in apartments, where metering tends to be for
water supplies entering the building, rather than for individual apartments,
although this is starting to change. In terms of the structure of prices
for public water services, there is a clear trend in some countries away
from fixed charges and towards volumetric charging; in other words, the
more you use, the more you pay.
Even where
fixed charges still exist, the policy of allowing large free allowances
is decline. Hungary, Poland and the Czech Republic, for example, already
use pricing systems based solely on volumetric pricing, with no fixed
charge element at all. To encourage conservation, the trend in volumetric
charging is also moving away from decreasing-block tariffs and towards
increasing-block ones. This means that the charge increases with each
additional unit of water used or wastewater treated, rather than providing
discounts to high-volume users. The pricing systems for wastewater treatment
are rather more complicated than they are for water supply.
This is partly
because responsibility for sewerage, sewage treatment, and drainage is
typically held by different bodies, each with their own principles and
practices. Another complicating factor is that use of water directly from
natural sources in the environment represents roughly 75% of total water
consumption by the industrial sector (on average) in some countries. Nevertheless,
the basic charges for wastewater services are sometimes linked directly
to volumes of water delivered from the public water supply system. Where
this is the case, the structure of wastewater charges tends to mirror
that of water supply systems. Overall, however, industrial water consumption
levels are actually not a very good proxy for industrial sewerage and
sewage disposal costs, as discharges vary so much from industry to industry.
Hence the trend in most countries towards separating industrial water
use charges from wastewater charges.
In most countries,
standard sewerage charges are supplemented by "special strength" charges
designed to recover the costs of any extra capacity required to treat
particular industrial effluents. Industrial effluent charges can also
be set by pollution content. In France, for example, a charge is levied
on the eight types of pollutant deemed most dangerous and difficult to
treat (heavy metals, phosphorus, soluble salts, etc.). The charge is calculated
as a function of pollution produced during the period of maximum activity
on a normal day. In other cases, the charging formula involved can reflect
the costs of treating a particular effluent, or the environmental sensitivity
of the receiving waters. Service providers generally receive the proceeds
of any industrial effluent charges. This revenue is sometimes channeled
into an investment fund that can either allocate the money to water service
providers, or to commission wastewater treatment investments directly.
Water charge
levels have been rising in most countries in recent years. One reason
for this is that water quality is often getting worse as a result of over-consumption
especially where groundwater is used). Moreover, government budgets have
been stretched to the limit, putting upward pressure on charges. Indeed,
there is a demand for more efficient and equitable approaches than across-the-board
subsidies for achieving social goals, like affordability. There are other
contributing factors, too. There may be past pollution of groundwater
that necessitates more sophisticated and more expensive treatment, with
a consequent need to develop more expensive demand-management or supply-based
regimes. Maintaining and enhancing existing sources can also require more
elaborate treatment to deal with new organic pollutants, often from non-point
sources. And there may be legislative reasons, with EU directives, for
instance, demanding tighter wastewater treatment standards.
As these
trends are unlikely to be significantly reversed in the near future, further
price increases are in the offing for most countries. Concern about the
affordability of household water services for vulnerable groups, such
as low-income households and retired people, has led to the development
of a range of policy measures aimed at resolving affordability problems,
while still meeting economic and environmental goals. In general, policies
that target specific vulnerable groups - such as through income-related
support - have been found to be more efficient at achieving all three
objectives than across-the-board subsidies. As regards "non-public" water
services, about half of countries levy some form of general charge on
water abstracted outside the public system.
In some countries,
this charge has an explicit environmental objective, so the proceeds are
allocated to an environmental fund. The Netherlands, for example, has
two abstraction charges: one levied by the provinces for groundwater protection;
and the other levied by the state within the general taxation regime.
For various reasons, some industries are finding that it is more efficient
to avoid using the public treatment system to dispose of their effluents,
and are developing their own self-treatment and re-use facilities. General
discharge controls are also often imposed on direct wastewater discharges
that do not go through public sewers. The proceeds of these charges always
go to the government, since there is no service provider involved.
For example,
a permit is usually required for discharging directly back into a river
or aquifer. Some countries reduce these charges on the basis of environmental
criteria. For example, there is a 75% reduction in the basic charge in
Germany if the environmental standards envisaged by current regulations
(expressed as "best available technique") are maintained. While pricing
structures for municipal and industrial water services increasingly reflect
the full costs of providing the services, agricultural water use - primarily
for irrigation - remains heavily subsidized, which encourages inefficient
use of often scarce resources. Recent reports indicate that industrial
and household water users often pay more than 100 times as much as agricultural
users, although comparisons of this type are difficult because of the
differing water quality needs and conveyance standards of different users.
Nevertheless,
it is clear that water prices are significantly lower for agriculture
than for other user sectors in most developed countries. Most countries
also are working towards more complete recovery of infrastructure and
operating costs from users, although rather slowly. Greater transparency,
including in the level of implicit subsidies provided through undercharging
for infrastructure use, could help build public support for further reforms.
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