Total Pool Chemicals Ltd
Swimming Pool Water Treatment Specialists
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Chemicals 
Filter Inspection
The Pool Water Treatment Advisory Group (PWTAG) recommends that filters are opened up and inspected internally once a year to ensure that the filter is operating correctly. This is particularly important to ensure that any cryptosporidium which may get into the pool is removed efficiently by the filters. (A sand filter in good condition using the correct level of flocculant will remove 95% of the cryptosporidium ocysts from the pool water.)
Total Pool Chemicals offers a comprehensive filter inspection service which involves isolating, draining and opening the filters and inspecting the following:
Ultrasonic Thickness Testing
The wall thickness of the filter vessel is checked in at least six places to ensure the filter structure is thick enough to carry out its duties. Particular attention is paid to the filter sand surface level where corrosion tends to be worst.
Sand Beds
The condition of the media is inspected and samples are taken away for analysis if necessary. The surface of the sand is also inspected for evidence of channelling or depressions. This indicates whether the under-drains are working properly. If sand is getting into the pool it is evidence that the bottom collector is damaged and the filter is not filtering properly.
Pipework
All external and internal pipework is investigated for leaks and corrosion. The supports are also checked for corrosion and damage.
Filter Vessel Surface
The internal filter coating is checked at the top of the filter and to 300 mm below the sand surface.The extent of any damage to the lining and corrosion is noted and photographed. Corrosion is usually worst close to the sand surface level and in the top of the filter.
Valves
All butterfly valves, isolation valves, air bleed valves and non-return valves are checked to see if they are passing and are in good working order.
Circulation Pumps
All seals are assessed to see if there are any leaks.
Filtration Plant Report
A written report detailing the condition of the filter with photographic evidence and recommendations for the repairs required is produced.
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