The
Swimming Pool Operators
and
Owners Pages (cont)
Page
4 - Chemical
Control and Dosing Equipment.
KEY
WORDS - Spa ozone ultra violet pH chlorine acid redox water
filter cynauric bromine calcium hypochlorite HTH sodium
chloramine combined pump multiport valve sand chemical
hydrochloric muriatic liner skimmer level deck tile grout plastic
weld electronic computer software probes electrode ioniser copper
silver fichlor dichlor trichlor dihalo aquabrome algae bacteria
filtration survey health safety pseudomonas aeroginosa e coli
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Service and Repair
of Electronic Dosing Systems
We carry out servicing, repairs, and
calibration of many types of electronic chemical control
systems. Our specialized testing and simulation equipment
enables us to set up and align systems to a very high degree
of accuracy. A wide range of electronic components are
stocked to facilitate repairs to printed circuits and
components.
pH
and Redox (ORP) Probes
We supply high quality, reliable probes,
for both pH and Redox control.There are a variety of designs
and connections. Our probes are designed to be used in the
commercial environment, and are built to resist accidental
damage. There are a variety of designs available to suit most
automatic dosing systems.
We manufacture Flow Cell assemblies, for
remote monitoring of pool and spa water. We supply both the
end user and our trade customers. Export enquiries are
welcome
Flow-Cells
for pH and Redox Probes
We manufacture a wall mounted
flow cell for the pH and Redox probes of almost any chemical
dosing controller. Our latest model features a transparent
body so that the probes can be viewed whilst still in the
sample flow, and a stainless steel grounding probe in the
base to dissipate any stray voltages which may be present in
the water
The Flowcell assembly comes
complete with a take-off regulator valve and wall fixing, and
can be supplied with or without the probes.
Other
Equipment Associated with Chemical Dosing Systems
We supply chemical storage Day Tanks and
Bunds from a capacity of 50 litres to 1,000 litres. We supply
chemical dosing tubing and safety tubing. We carry spares for a
wide range of Chemical Dosing Pumps
We supply a range of CO2 dosing systems for
every size pool, from single cylinder systems for home pools, to
large multi cylinder systems for big commercial pools and leisure
parks. CO2 provides a clean, simple, and safe solution to the
hazardous use of liquid chemicals in tanks. The risk of
accidently generating Chlorine Gas is virtually eliminated..
Neither do chemicals have to be mixed or decanted, poured or
pumped. CO2 gas is not poisonous.
Our Mini CO2 System
is ideal for residential, school, or hotel pools and spa's and is
very economically priced. It is suitable for automatic or
semi-automatic control of pH
The MINI-MINDER is produced in Australia, and
is a reliable, and economically priced pH and Redox automated
chemical dosing controller. In the UK, it is mounted on a strong
plastic board, along with two chemical dosing pumps, and a
circulation pump contactor, and has provision for a flow or
pressure switch to be used, for added safety.
The 7 day timer will control the circulation
pump if required. The set-points for both pH and Redox levels are
easily programmable. The LCD display gives a digital read out of
both the pH and the Redox.
Probably the most interesting, is the
calibration method. With the controller installed and running,
the pH of the pool water is checked using a manual test kit. This
value is simply entered into the machine via the keypad, and the
calibration button is pressed. - Finished !! That is all there is
to calibration. Buffer solutions, Zero and Slope are all obsolete
with the MINI-MINDER, and the machine is calibrated to the WATER.
The Redox is a direct reading and does not require calibrating.
Installation is also simple. The assempbly is
pre-wired for simplicity with a 2 meter tail for the supply
connection, and a junction box for the circulation pump
connection. Two holes are drilled in the circulation pipework for
the chemical dosing injectors, and another two are drilled in the
suction pipe to take the pH and Redox probes
We have found the MINI-MINDER pool
controllers to be very reliable and easy to use. With
alterations, such as dose pump sizes, and electrical control,
they are suitable for almost any size pool.
The MINDER II is similar to the Mini-Minder,
but has a lot more features. Not only does it control the
circulation pumps, but also up to three other items can be
controlled either manually from the keypad, or by the eight 7 Day
timers.
Internal relays are connected to the
appropriate pumps, motors, or lights etc, to provide total
control, not only of the chemical dosing but also of the
mechanical systems.
We are the European Service Agents for the
Minder Pool Controllers. If you would like further details and
prices, please contact us.
The Minder Controllers are sold in several
European countries, but they would still like additional overseas
distributors. If you are interested in being a distributor please
send us your full details, and we will pass these to the Minder
Systems manufactures.
We have been carrying out research into the
effectiveness of ULTRA-VIOLET DISINFECTION for both residential
and commercial pools.
Ultra-Violet disinfection is ideal where the
users of the pool are either allergic to chlorine, or are
chemically sensitive to the usual swimming pool disinfectants, or
the "heavy metals" from ionic purifiers.
We have developed an oxidizing system using
Hydrogen Peroroxide (H2O2) coupled to an Ultra-Violet generator,
to produce a very simple to operate Ultra-Violate Disinfection
System.
A suitably sized Ultra-Violet disinfection
system installed on a swimming pool, will produce crystal clear,
sterile water, which feels soft ond silky, and pleasant to swim
in, with no harmfull residuals building up.
We have now had an outdoor 30,000 Imp gallon
test pool operating since 1993. The owner is extremely chemically
sensitive to a wide range of common chemicals.
Since the Ultra-Violet Disinfection Sytem was
installed, no chlorine, algecides, flocculants etc have been used
in any way. pH control is acheived with hydrochloric acid
(muriatic acid) - a "natural" acid, on a weekly basis,
a trace of hydrogen peroxide is maintained in the pool water. and
the sand filter is thoroughly backwashed every week.
The owner, her family, and friends use the
pool almost every day from April to late October. The operating
temperature is 95 deg F. (yes! she insists that it is kept at
that temperature!)
The water has remained crystal clear, and
completely free of algea, both suspended and on the pool shell,
and the owner confirms that the pool is a joy to use, with none
of the unpleasant and painfull reactions that she has experienced
with other forms of disinfection.
The illustration above shows the new model
Ultra-Violet Purifier, suitable for residential pools up to about
25,000 imperial gallons. The circulation water can enter at
either end. The unit is mounted on a plastic back board, and
2" Socket Unions are provided for easy installation. Power
consumption is just 76 watts - 230 Volts AC.
There are now a number of commercial swimming
pool sites where Ultra-Violet systems have been installed. These
sites still maintain a residual chlorine level, but achieve
savings on their chlorine consumption, reduced combined chlorine
compounds, and increased microbiological safety.
We are at present involved in researching and
monitoring the installation of an Ultra-Violet system at a busy
public leisure centre pool. We will be updating our web site
information as the operation progresses. - As they say - Watch
This Space !
Below is a photograph of the Commercial
UltraViolet system installed at Colchester Leisure World on their
teaching pool. This is a very busy teaching pool along side the
main leisure pool but partitioned off with glass and brick. The
water temperature is somewhat higher than the main pool.
Colchester is one of three sites where we
were engaged to monitor the performance and efficiency of the
commercial Ultra-Violet Swimming Pool Units for 12 months. The
others are Hadleigh Leisure Center - Hadleigh, Suffolk., and
Highbury Leisure Center at Islington, London.
We monitored the performance of the
Colchester unit from spring 1997. Prior to the installation of
the UV system, despite the Free Chlorine level being always
maintained at at least 2 ppm (mg/l), the Combined Chlorine level
was always at at least 1 ppm (mg/l). This was apparently due to
the high bather load, and the additional pollutants introduced by
the bathers - particularly children.
Before the installation, it was stressed to
the pool and plantroom staff that there must be no change
whatsoever to the day to day pool operations without instructions
from ourselves. This would enable us to make a valid comparison
and accurately judge the effectiveness of the UV System
Within a two or three days of switching on
the UV, the Combined Chlorine levels were seen to rapidly fall to
levels of 0.1 to 0.2 ppm (mg/l). This was due to the powerful
photochemical effect that UV has on the chlorine by-product
compounds after disinfection and oxidation has taken place.
After some weeks of monitoring, we commenced
to lower the Free Chlorine level in small stages. During this
time there was regular and frequent microbiological analysis of
the water.
Eventually, we reached a Free Chlorine level
of 0.6 ppm (mg/l), and decided not to reduce the level any
further. For the entire period, the Combined Chlorine had
remained at approximately 0.1 ppm (mg/l), - and at one stage the
staff actually recorded a zero reading for Combined Chlorine. The
Microbiological results have always shown a negative count
throughout the entire test period.
This U.V. unit continues to operate at
Leisure World. The Free Chlorine level remains at 0.6 ppm (mg/l)
and the Combined Chlorine level remains stable at around 0.1 ppm
(mg/l)
Both the other installations provided similar
results, and we hope to be able to post details here soon.
If you are an overseas distributor, or
installer, and you are interested in distributing these
Ultra-Violet Purifiers, please email us your full details and we
will pass them on to the manufacturer.
There are Email Links on Page 1
and Page 12
END OF PAGE 4