Crystal Right works by an ion exchange process which removes iron, manganese and hardness. The minimum pH requirement is 6.0 and Crystal Right will raise the pH in these acidic waters. Crystal Right works at its best on clear water, i.e. when the iron/manganese are in a dissolved form. Crystal Right will also remove hardness with no extra treatment. Ammonia, lead, hydrogen sulphide and copper can also be reduced. The media bed can be sanitised with chlorine from time to time. The regeneration process is exactly the same as that used in a water softener and requires regeneration with salt (sodium chloride). There are two types of Crystal Right. CR100 is used where the pH is between 6 and 7 and will increase the pH. CR200 is used where the pH is 7 or above. Crystal Right has a number of advantages over conventional systems in that pH correction, iron/manganese removal and softening can all be addressed in a single process.
Combination of Manganese & Iron: Up to 15 PPM
Hydrogen Sulfide (H2S): Less than .5 PPM
Hardness as CaCo3: >50 ppm minimum needed
Minimum TDS: 80 PPM
No aluminium should be present in feed water.
pH Range: 6-11 (CR100) 7-11 (CR200)
Iron must be in soluble ferrous form*
*Water containing ferrous iron is clear and colorless because the iron is completely dissolved.
Crystal Right should be concidered where iron and or manganese and hardness need to be tackled or where you need to raise pH but don't want to install a seperate pH system or where higher backwashing rates can't be acheived as would be needed with Filox or Birm.
The main disadvantage is having to periodically top up the system with salt.
How Does it Work?
Water flows into the valve at the top, down through the media and then up through the riser tube in the middle of the vessel. As the water travels through the media the iron and manganese are removed leaving crystal clear water. There are timer options that can be set to automatically self clean (backwash) and wash away any of the accumulated iron and manganese. Cleaning can be set for a given time or after a certain amount of water has been used. With Crystal Right salt is also added to regenerate it ready for service. Iron and manganese filters can also be used in conjunction with other filters such as sand filters if the water has high turbidity or pH correction filters if the pH of the water very low.