NQA
European Commission project  for your
afm logo of dryden aqua active filter media

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Environmental & sustainable water treatment to save the planet
Trade marked and Patented
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Large seawater lagoons and lido systems now possible with the minimum of filtration when ACO, NoPhos and APF products are used to treat the water.   Perfotmance factor of public swimming pool systems reduced to less than 2 giving an 80% to 90% reduction in chlorine consumption.
How to operate and install filters   
Table of operating flow rates, back-wash flow rates and back-wash frequencyclick here
Pressure filter installation notesclick here
Detailed operating notesclick here
Valve manifold and valve positionsclick here
Typical installationsclick here
Automatic valve sequencingclick here