I have a Haque H3500. I just had my RO serviced. Now the water has a bit of a foul smell and doesn't taste right. The tech did the following. He ran a packet of disinfectant through the system. Then he replaced the PCF (prolonged contact) filter with one he repacked. He replaced the prefilter. He replaced the finishing filter with a carbon block filter instead of the GAC filter that originally came with the unit. This is frustrating. The TDS rejection is an excellent 97%. I am just venting. I guess I need to get him back here to get it right. In the meantime, I am going to do a bacteria test.
A bit more info. The smell is a slight sulfur/rotten egg smell. The best way to describe it is the water has a metallic/acidic taste.
Any opinions are appreciated.