Hi All! So for years I've been looking into the right system to keep plants watered when away on a trip. I've found that you can really over water plants before leaving and give a couple extra days of moisture by filling the saucer up, but clearly that's not the healthiest advice. I finally found a method on what works, so I'll list it below but I've got a question too. Here's the setup: Get a reservoir (I use an 11 gallon black bucket) and a pump. Get yourself a timer that can be programmed down to the seconds. I set mine for about 30 seconds. Get some tubing and some drip system stakes and attach these to your plants. My soil tends to be a little loose so I will also use some cheap clamps and clamp the line to the edge of the pot without bending it. Here's a key I found-- you (obviously) need to measure how much water gets added to your plants and adjust the timer accordingly, but even if you do that you may get a siphon affect... weirdly, the bottom of my siphon was lower than the exit holes, so not sure why I got that, but it would siphon for a while before dying down... just put a little pinhole at the top of your line and this will interrupt your siphon because air will get in the line... this does not affect the pump outside of a few squirts. For that reason, my pinhole is inside of my water reservoir (which has a lid). ANYWAY-- this system works really great and I was able to take a two week vacation DURING flower with dry nutrients in the soil, slowly releasing with no ill effects. Even after coming back, I let it coast for another 10 days before finally starting to hand-water again... why? I had a problem. My plants started having a nutrient lock-out even though the soil was adequately amended. Apparently, over time, the PH of the water in the reservoir started raising on its own. It started out at about a 6.0, but by the time I measured it it became about a 7.5. The plastic of the reservoir isn't supposed to be reactive, so is this just from sitting around? Has anybody had water slowly raise its pH seemingly for no reason? Any advice on why this is happening and how to keep the pH steady over time? Is there a buffer I should add?