Positives

• One ME/CFS patient with MCS reported that chlorine sensitivity made tap water showers difficult and that installing a shower filter was one of the first environmental interventions that meaningfully reduced her daily exposure burden; she also noted the challenge of finding a way to have a bath in water that isn’t heavily chlorinated Phoenix Rising.
  
  
• Another forum member suggested that inexpensive diverter wands (which attach to a filtered showerhead and allow you to fill a bathtub with already-filtered water) were a practical workaround for MCS patients who react to chlorinated bath water Phoenix Rising.
  
  

Negatives

• An Environmental Working Group review of reverse osmosis filtration concluded the systems are most useful when local water has a specific contaminant problem, and that for households on already-compliant municipal water, the marginal health benefit is small relative to cost. Ewg.
• A Culligan article on coronavirus and home water systems noted that SARS-CoV-2 has not been detected in drinking-water supplies and that risk to water supplies is low, meaning Long COVID patients should not expect filtration to address ongoing symptoms. Culligan.

Hurdles & Side Effects

• Water filtration for MCS and mold-sensitive patients spans a wide range of options: activated-carbon shower filters (cheap, reduce chlorine), whole-house carbon filters (more expensive but cover cooking and bathing), reverse osmosis (removes most contaminants but is slow and wastes water), and distillation (most thorough but energy-intensive); forum members note that the right choice depends on the specific contaminants a patient reacts to Phoenix Rising.