Improvements in connection with the cleaning of filter beds
GB644655A
Improvements in connection with means for operating a low speed reciprocating pump or pumps from a rapidly rotating source of power
GB620923A
Improvements in connection with apparatus employed in the proportional treatment of water or other liquids by reagents
GB621919A
Improvements in connection with the purification of water in tanks
GB618196A
Improvements in connection with filters
GB612738A
Improvements in apparatus for adding proportional doses of fluid to water or other liquid flowing under pressure
GB611482A
Improvements in connection with the addition of a liquid to water, or other liquid, flowing in a pipe
GB610458A
Improvements in means for mixing flowing liquids together, especially suitable for mixing a relatively small intermittent or uneven supply with a relatively large continuous flow
GB599030A
Improvements in apparatus by means of which dirt and other solid matter can be removed from underwater floors such as those of swimming pools
GB569982A
Improvements in means for automatically controlling the operation of a reciprocatinghydraulic engine
GB566235A
Improvements in connection with the proportionate addition of a chemical fluid to another fluid requiring chemical treatment
GB565550A
Improvements in connection with settling tanks employed in the purification of water
GB556447A
Improvements in connection with the purification of water in tanks
GB542682A
Improvements in connection with the proportional treatment of water by reagents
GB538448A
Improvements in means for use in connection with the treatment of water by aeration
GB534312A
Improvements in connection with filters
GB525909A
Improvements in means for use in connection with the addition of chemical solutions to water
GB524758A
Improvements in connection with settling tanks employed in the purification of water
GB524858A
Improvements in connection with settling tanks employed in the purification of water
GB513489A
Apparatus for measuring chlorine or other gas and particularly suitable for use in connection with the proportional dosage of water
