Reverse osmosis systems are reliable \u2014 but they’re also mechanical systems with membranes, valves, pumps, and pressure-sensitive components that develop specific failure modes over time. Most RO problems follow predictable patterns, and most of them have straightforward fixes that don’t require a service call. Here’s a systematic approach to troubleshooting any reverse osmosis system.<\/p>\n
This is the most common RO complaint. Work through this checklist in order:<\/p>\n
Normal fill time for a residential RO tank is roughly 2\u20134 hours from empty. If it’s taking significantly longer:<\/p>\n
RO water should have essentially no taste. If it has one, the cause is usually traceable:<\/p>\n
Most RO leaks are at push-to-connect fittings \u2014 the quick-connect couplings that join tubing to components. A fitting that wasn’t fully seated during installation or that worked loose over time is the most common source.<\/p>\n
How to check push-to-connect fittings:<\/p>\n
If a fitting still leaks after reseating, the fitting itself or the associated O-ring may be damaged. Replace the fitting \u2014 they’re inexpensive.<\/p>\n
A properly functioning RO system should stop producing water when the storage tank reaches about 2\/3 of feed water pressure. If it’s running constantly:<\/p>\n
TDS rejection below 90% indicates membrane degradation or failure:<\/p>\n
If your post-RO water is leaving scale, the remineralization cartridge is overdosing, or the system isn’t working correctly and hard tap water is bypassing the RO. Check that all connections are correctly routed and that the remineralization cartridge’s media hasn’t exhausted in a way that causes a chemistry shift.<\/p>\n
| Component<\/th>\n | Interval<\/th>\n | Cost (Residential)<\/th>\n<\/tr>\n |
|---|---|---|
| Sediment pre-filter<\/td>\n | 6\u201312 months<\/td>\n | $10\u2013$25<\/td>\n<\/tr>\n |
| Carbon pre-filter(s)<\/td>\n | 6\u201312 months<\/td>\n | $15\u2013$30<\/td>\n<\/tr>\n |
| Post-carbon filter<\/td>\n | 6\u201312 months<\/td>\n | $15\u2013$25<\/td>\n<\/tr>\n |
| Remineralization cartridge<\/td>\n | 6\u201312 months<\/td>\n | $20\u2013$40<\/td>\n<\/tr>\n |
| RO membrane<\/td>\n | 2\u20135 years<\/td>\n | $30\u2013$80<\/td>\n<\/tr>\n |
| Tank pressure check<\/td>\n | Annually<\/td>\n | Free<\/td>\n<\/tr>\n |
| TDS testing<\/td>\n | Quarterly<\/td>\n | $15 for TDS meter (one-time)<\/td>\n<\/tr>\n<\/table>\n |