I've been using an RODI from PurelyH2O and I think its great. Before that I used the tap water filter and I didn't really have any issues with that either but since changing to RODI I've noticed such a diffrence. Go the extra mile!
This new generation of R.O. technology will remove up to 99% of all silicates and more phosphates, nitrates and heavy metals than other R.O. units. Filters 35 gallons per day.