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other contributing factors to water temps in RDWC .. -quality of insulation on buckets, or lack of -air pump is pulling air from inside hot room and into your buckets -direct light from HID on buckets -filter is clogged causing slower recirculation and decreased contact to cooled coil in epicenter.

If your thinking of getting into RDWC a chiller is a must! go as large as you can afford! A very knowledgeable farmer by the name of @ttystikk has multiple posts and discussions on the utilization of chillers and heat sinks ( ice boxes ) to cool multiple rooms and reservoirs. I would recommend...

For sure on that, however I was under the impression that you can only remove a percentage of the solids using reverse osmosis. If i remember correctly my brand new filters were removing between 350 and 400 ppm. Another factor that Im still shaky on is whether or not I subtract the initial ppm...

The water in my town is particularly rich at 750 ppm and coming out of my RO at 500. How much more Cal/mag supplementation should I be adding to my nute soup considering the high tds? Also, how should this effect the amount ( or ppm )of base nutrient added?