Water pH

[tropterrarium]

OP: triple *filtered* water is having more or less the same amount of dissolved molecules/ions as tap water. So your TOC value is not going to be lowered, and pH is more or less the same.

There is triple *distilled* water, also known as a form of ultra pure water for biochemistry applications. This is close to nothing but H2O, no minerals, no ions, no nothing. Using DI or distilled water can have strong effects on pH, and adding fertilizer can further complicate things. That's why three are "pure water" fertilizer versions.

When people in orchid growing circle talk about pure water, most refer to Reverse Osmosis (occasionally DeIonization columns). This is closer to distilled/rain water than tap/filtered water.

Just was wondering whether there was some confusion re triple type waters. Ray has explained that in various posts in case you are interested.