Hydranautics ESPA1-4040 Home / Shop Hydranautics ESPA1-4040 $335.00 Home / Shop Hydranautics ESPA1-4040 $335.00 Model Number: Hydranautics-ESPA1-4040 Maximum quantity exceeded Minimum purchase amount of 0 is required Maximum purchase amount of 0 is allowed 335.000 10000000 Categories: Reverse Osmosis Membranes Manufacturer: Hydranautics Description The growing family of ESPA (Energy-Saving Polyamide) RO membranes continues to meet the ever-increasing demands of the water treatment industry.