ZeroWater Filter Replacement: When Is It Really Exhausted for CPs?

You use a ZeroWater filter for carnivorous plants. Manufacturer says replace at 6 ppm TDS. CP-safe threshold is ~70 ppm. Can you push the filter to 70 ppm?

Not recommended. ZeroWater filters show a sharp TDS rise once exhausted—you might get a gallon or two past 70 ppm, then water quality plummets. The "fishy" smell signals filter failure. Unknown compounds may break through before TDS spikes.

Replace at 10–20 ppm for safety. The cost of a filter is trivial compared to losing a rare plant. For drinking water, the 6 ppm standard makes sense; for CPs, err on the side of caution.