My process for topping up is as follows- add 8l of RO water. Add my nutrients and stirring between each one. Adjust the ph if needed. My RO water is very alkaline and has a ph of 7.5-8. My plants are growing my ph everyday went down by 0.1 and by 7 days it had gone down to 5.6 but there was no room in my reservoir to top up so everyday I have to add in ph up. Now according to chat gpt which could be wrong- i need to adjust my top off water in my bucket to around 6.8 then add the nutrients and then pour it into the tower garden. This is what it said Why adjusting water down to ~6.8 helps By pre‑adjusting the water to ~6.8, you’re partially neutralizing the alkalinity of the water before adding nutrients. This reduces the initial chemical reaction between the alkaline carbonates and the acidic nutrient salts. As a result: The solution starts closer to the target pH Less “correction” is needed after adding nutrients Over time, the pH stays more stable because the main source of drift (reaction of water alkalinity with nutrient acids) has been reduced Think of it like pre‑tempering the water so the nutrient solution can settle at your target pH instead of swinging around.