Please explain these values ​​of the water that has flowed through the pot

Water was pH 6.16, that’s good. Runoff pH 7.62 is too high. EC 1.45 (725 ppm) is okay. Next time use pH 5.8–6.0 water to lower pH. Check runoff again next time.

A few things to remember with regard to growing indoors that are often neglected to mention. You have used a mulch, light won't evaporate top couple inches of soil. With plastic pots, meaning 0% of the water will evaporate from medium above 50%RH especially so with plastic pots and mulch. Plant is dependent on transpiration to remove water from pot, when evaporation is low or non existent and transpiration is crippled or slow this could very quickly leave the medium oversaturated, but that's something you should be able to notice visiting the tent daily. Also to note, transpiration itself is responsible for nutrient uptake so if it's slow, alot of the salts your feeding your medium will just sit in the medium building up EC in medium. Transpiration is a daytime only process, which draws moisture from soil and pulls it up using cohesive force of suction. At night no water leaves medium it sits and stagnates. Soil aeration is crucial for phosphorous uptake, upto 51% of phosphorous in a plant is uptaken early hours of nightfall (given conditions ofc) Water is a transport fluid, a solvent. If it's going in at 6.16 and coming out at 7.62 it means as the water is passing through medium picking up excess salts, with no where to attach its just leeching out the bottom. If your pH is going up, there is a over abundance of the big 3 cation, Ca, Mg, K. Micro-nutrient uptake is effected above a pH of 7, symptom normally present as a lime-greening of leaf all over with no obvious starting point, similar to what I see in your pictures. There are 2 methods of taking EC readings, you can take a EC from water which will read total dissolved solids in form of ppm. There is also a soil EC metre this will give you a EC reading for the medium. This should generally sit around 0.5-1.8, never higher than 2.0 and is measured in ms/cm or us/cm. Basically micro and milli. units or whatever. There are conversions you can use for ppm to us/cm, to make it simple but I forget exactly what they are. Easy to find if needed. You should dilute your medium to reduce the salt content, reapply desired ph'd water once EC level return to range. Then apply a balanced fertilizer suited to stage of growth. Keeping tabs on ec and ph periodically.

Your plants look fine for now – no signs of major lockout yet. The pH drift you measured could partly come from measuring errors (common with cheap or uncalibrated meters). It’s still a good idea to slowly bring runoff closer to 6.2–6.5 over time. No need to panic – just check your pH meter calibration and water carefully for the next weeks.

Side note your soil ph is high I would start watering with water that is buffed low so it can pull down the ph. Watering at just 6.4 will not be low enough to pull the ph down quickly or at all really. I’d ph your water to 5 next time you water and I’d water a little extra just to help pull the ph down After most of the water has run out the pot then collect some run off water and check ph again my guess if you run 4 or 5 gallons at ph5 it will bring you back to a decent soil ph zone

Hey there good question I checked out your diary good start So your saying your input water was ph 6.16 and the run off water was 7.62 Well to talk about ph 1st ph is the measurement of how acidic or alkaline the water is lower is acidic high is alkaline both extremes for a plant can be bad The reason your run off water ph is different from the input water can vary for many reasons 1. The soil started with some type of buffer making it more alkaline 2. You have added to much ph up into your waterings in the past and the soil ph is just high from that 3. Maybe you have been watering with plain tap water seeing tap water is ussally ph 7 to 8.5 maybe the soil ph is high because of tap water 4. There are nutrients that have different things in them that are alkaline maybe there is some type of build up of something you used in the past Let’s talk about ppm… ppm stand for parts per million it’s really just a measurement of how many super small pieces of anything are in the water usssally the high the number gets the more nutrients have built up in the soil Now let’s talk ec now ec is very similar but different it stands for electricity conductivity It's a measure of how well water can conduct an electrical current. In simpler terms, it tells you how many dissolved salts or minerals are in the water. It’s more a measurement of specific things in the water when ppm is the amount of anything in the water Honestly for a new grower and your going in soil don’t even worry about ppm or ec 99.99% of the time you will never run into a problem revolving around ppm or ec when growing in soil As a new grower some better places to put your focus is temps and humidity and make sure to get watering down correctly these things alone can make a plant grow a lot better when done cor

Hey growmie, your runoff pH at 7.62 is too high, that can cause nutrient lockout soon. The EC (1452 µS/cm / ~725 ppm) looks fine, but that rising pH suggests some salt buildup or your medium’s going alkaline. I’d lower your next watering to around pH 5.8–6.0 and maybe do a light flush to get things back in range. Aim for runoff closer to 6.2–6.5. Should be easy to fix if you catch it now.