Hydrologic Micro Ro System 75 Gpd Integrated Pressure Gauge With Safe Zones. Hydro-logic micro 75 compact portable ro filter system. At tollaapro, we are committed to providing our customers with the best possible on-line shopping experience. This includes a commitment to excellent customer service, even after your order has been delivered.Tollaa offers quality items at lower prices. We pride ourselves on the highest quality customer service. We hope you Enjoy your visit! You may also be interested in.. The item "Hydrologic Micro Ro System 75 Gpd Integrated Pressure Gauge With Safe Zones" is in sale since Sunday, October 20, 2019. This item is in the category "Home & Garden\Yard, Garden & Outdoor Living\Hydroponics\Hydroponic Systems, Parts & Accessories\Water Aeration Equipment". The seller is "tollaapro" and is located in Hallandale, Florida. This item can be shipped to United States.