GrowMax Water 75 GPD reverse osmosis membrane for: Minimax 75

The GrowMax 75 GPD RO membrane is the central component of the MiniMax 75 reverse osmosis system . It ensures you receive ultrapure water with an extremely low EC value – ideal for hydroponics, compost tea, organic fertilizers, and sensitive plants .

Highly efficient filtration with up to 95% retention rate

The membrane reliably filters a variety of dissolved substances from the water, including:

• Salts & Lime
• Nitrate & Nitrite
• Heavy metals (e.g. lead, copper, zinc)
• Fluoride, phosphates
• organic compounds & drug residues

The result is soft osmosis water with a low EC value of 0.0–0.2 mS/cm and an ideal pH value for plant uptake .

Replacement & Lifespan

The membrane has a lifespan of approximately 12 months , depending on water quality and usage. Replacement is recommended if the EC value of the reverse osmosis water increases or the flow rate drops significantly. Replacing the membrane is straightforward and only takes a few minutes.

Technical data

• Capacity: 75 GPD (approx. 280 L/day)
• Type: Thin Film Composite (TFC)
• Compatibility: GrowMax MiniMax 75
• Fits: Standard RO membrane housing (11.75")
• Retention rate: up to 95%

With the GrowMax 75 GPD RO membrane, you get permanently clean water for your cultivation system – especially important for organic crops, sensitive varieties or precise nutrient control .

Shipping costs
For shipping within Germany, we charge a flat rate of €6.90 , and for seed orders, it's just €3.90 . We want to offer you a special shopping experience – for orders over €150, we cover the shipping costs for you, so your order will be delivered to your home free of charge.

Shipping time
We know how important fast and secure deliveries are. That's why your order will be carefully packaged and insured within Germany to ensure it arrives safely. Delivery time is typically 1-4 business days , so you can have your desired products in your hands soon.

You can return your order to us within 14 days.