@WeedDoctorSam, it's a 10 litre folding water bag, I got 2 of them cheap on amazon. I started off using the bags to fill my tank and then ended up using them for emptying it. I take the return line from my aquarium chiller (pumped) and put it in to the bag to drain, usually 1 bag as I always drain the tank when its half full or below.
I use a 12 litre bucket now to fill up my tank as it's easier to keep clean/sterile than the bags. I would usually swap out my nutrients every 7-10 days, usually with 1-2 top ups during that time depending on the level, temperature or how thirsty the ladies get.
I was mixing the nutrient directly in my grow tank but now I mix them in a separate tank (50 litre storage box, same as my grow tank) and pump them with a small submersible pump and a few meters of hose. I fill my bucket (twice) with ro water, empty that into my mixing tank, add all of my nutrients, check my ph/ppm and then pump it in when the old nutes have drained and I've put my return line back
Let me know if you need any more info! Happy growing! 😀
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