Reverse osmosis membrane technology

KGX is the CONGEXIN membrane series; 30 is the diameter, 3.0 inches (about 7.62 cm); 13 is the length, 13 inches (about 33.02 cm); 400 is the output, 400 gallons (about 1514 L) of product water per 24 hours under standard conditions.

From coarse to fine, the four membrane types are microfiltration, ultrafiltration, nanofiltration and reverse osmosis. RO is the finest: it holds back dissolved salts and organic molecules above a molecular weight of about 100 and lets water molecules through. Composite RO membranes typically reject more than 98% of salts.

Typically every 12 to 36 months, depending on water consumption and feed water quality. Check and replace the element when output or salt rejection drops noticeably.

Indoors at 5–35 °C, dry, ventilated and out of direct sunlight; never let them freeze or soak. Use wet elements within 6 months of shipment and dry elements within 1 year.

Wet the seals with clean water or glycerine only, never lubricants, oil or thinners; check that the brine seal at the feed end opens outwards and that the connector O-rings are complete and undamaged; handle elements gently and never hammer them.

Common causes are oxidation damage from chlorine or ozone, a leaking membrane sheet or a leaking O-ring. Keep free chlorine in the feed below 0.1 mg/L; oxidation damage or a leaking sheet means the element must be replaced.