Our comprehensive range of GRP filters are manufactured with a liner employing special resins which form a watertight, anti-corrosive barrier, giving a high chemical resistance to chemicals.

An outer fibre-glass shell is then applied to the liner using a bobbin winding process.

We supply all well known manufacturers of GRP filters including Astral, Certikin, Calplas and Waterco.

Our mild steel filters are manufactured to current guidelines and typically have 8mm thick plate on the shell and 12mm thick plate on the dished end.

The filters come complete with 600mm side and top mounted access Manways with bolted lids.

The filter internals have an upper bell mouth system and a lower lateral set manufactured from PVC connected to a central PVC header the underdrain system supported on a concrete base. We can alternatively supply steel filters with nozzle plates and an optional sight glass. All of our steel filters are manufactured to comply to current BS standards.

Filters can be manufactured in various diameters depending on the application required.

The filters are manufactured from fibreglass and polyester resin; the internal pipework and distribution system is manufactured from PVC and polypropylene.

Plant rooms can be congested and have limited access and when filters fail and require replacement, it is not possible to get filters into the plant room.

We can offer a solution to this with our split filters which come in a variety of sizes from 1.2m to 1.8m diameter.

They can be delivered in two parts and assembled on site in the plant room. The two halves seal perfectly, using double o’ring and held together by a flange using bolts and nuts. The filter is specifically designed to fit through existing standard size plant room doors.

Sterling also supply and install new generation filters which offer improved water quality and operational cost savings. Click on this link for more details.

Typical construction is a stainless steel orifice plate which is installed in the circulation pipework which is supplied with an analogue dial gauge to indicate the flow measurement. It works by measuring the pressure drop across the orifice plate which is one of the most widely accepted methods for determining flow. Reliability is assured as there are no moving parts which could cause a failure.

This type of flow meter is available as standard for pipe sizes up to 12”. Larger units are available on special request.

Digital meters are typically electromagnetic flow meters which offer greater accuracy over analogue meters as well as increased functionality such as data logging and connectivity via analogue or digital outputs.

The flow meter sensors are installed into the circulation pipework as normal. Flexible installation options allow the digital sensors to mounted together with the display unit or separate if preferred.

There is minimum maintenance with digital meter as there are no moving parts and typically, they have self-cleaning sensor electrodes.

This type of flow meter is available for pipe sizes up to 48” so more than adequate for swimming pool applications.

Sodium Hypochlorite (available in 14/15% carboys or <1% onsite generation using a Hyprolyser)

Calcium Hypochlorite (available in 65-70% in granular form)

Sodium Bisulphate
Hydrochloric Acid
CO2

PAC is a flocculent and is used to increase the filtration efficiency by causing small particles to bind together which can then be more effectively removed by sand filters. In general terms, the clarity of the pool water increases significantly when using PAC as less suspended matter passes through the filters.

Some of these small particles are bacteria and although chlorine will destroy bacteria and oxidize organic materials, they remain in the water as a suspended solid and without PAC are too small to be removed by sand filtration alone.

PWTAG recommends flocculation to prevent filter breakthrough of Cryptosporidium (99.9% removal). Because of this PAC is being retrofitted to many existing installations for the benefits previously given and on new swimming pools they have become the norm.

Sterling can install PAC dosing systems on new or existing installations and can be used on all types of pools from leisure, competition and learner pools.

Did you know your plant room could be subject to chlorine gas, a potentially fatal and extremely harmful gas? Are you and your staff protected from a chlorine gas incident? This is where a gas detection system provides an important solution.

This flexible multi-function device warns the operating personnel if a defined concentration of gas is reached in the air, alerting them to evacuate to safety. Typically, there is a flexible two channel measuring system designed for gas monitoring in up to two rooms. It can either use a single Chloratect sensor or a pair of Chloratect sensors to measure chlorine gas.

The gas concentrations are displayed on the display panel. The peak and average values over the past 8 hours can also be displayed. The desired alarm levels can be set using the menu via a control pad. Two values per channel can be specified. An alarm contact is activated for each limit value and the system will also set off an audible and a visual alarm.

Sterling can supply, install and commission gas monitoring systems to suit all pool requirements.