pH Down 3ACID Down for hydroponics - Hydropassion is a 3 in 1 mineral acid based pH regulator.
The AUTO pH Regulator TORUS 260L will allow you to automatically regulate the pH. You will need to recharge it within 8 to 12 weeks.
The TORUS 380L AUTO pH Regulator - INLINE Version - For Hydroponics is a pH stabilizer that will automatically regulate the pH of your fertilizer solutions. This Torus Hydro model is designed for hydroponic and fertilizer tanks up to 130 liters (35 Gallons).
The AUTO pH Regulator TORUS 380L will allow you to automatically regulate the pH of your hydroponic solution. It is suitable for 380L tanks. You have to refill it within 8 to 12 weeks.