Quote Originally Posted by the image reaper
does a TDS meter read by conductivity, too ? ... I thought the EC meter worked on that principle ... ??
Most meters take an EC reading and convert that to approximate TDS.
gainesvillegreen Reviewed by gainesvillegreen on . R/O water systems as more time goes by i start to realize how important it is to use good water when growing. seems as tho every serious hydro grower uses R/O water. which leads me to my question. what type of R/O system do you have 3 stage, 4 stage? it is a portable system or a permanent system with res? how many gpd does your system filter? also do you also use a DI filter? i have been searching on fleabay for a system. looks like some good prices but not sure on the unit i need. looking at a Rating: 5