You may want to look at your municipal water report to get a better idea whether or not the Total Dissolved Solids are high enough to bother with RO. Remember, RO is lacking in ALL nutrients, so your fertilizer will have to supply it all. Especially Calcium, Magnesium and micronutrients. Sounds like you have only a few plants, so your current method works as long as there is some forethought. When your collection increases, there are ways to store more water to fill your needs. I have about 400 plants that I water with RO. I use a 5 stage under sink unit that I kicked up to 75 GPD output. I installed it in the garage using the washer inline. I tapped into the output line just before it reaches the storage vessel. I installed a Tee and a manual on/off valve, then ran 1/4" polytube across the yard, under the grass and into a trash barrel in my shadehouse. The evening after watering, I open the valve just before bed, then turn it off when I awake in the morning. This gives me roughly 30 gallons of easily accessible RO.
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