Standard Size: Membrane Solutions compatible with most 10″ standard under the counter reverse osmosis water systems, such as: APEC Water ESSENCE ROES-50, ROES-75, ROES-PH75, ROES-PHUV75, ROES-UV75-SS, ROES-UV75, FILTER-MAX-ES50, FILTER-MAX-ESPH, RO-45, RO-90, RO-PERM, RO-PUMP, WFS-1000 AQUALUTIO AL-1117 iSpring F9K, RCC7AK, RCC7P-AK, RCC7PAK, RCC7, RCS5T, US31, RCC7P, F7-GAC, F7RO, F3_SML , RCC7AK-UV, RCC7D, RCC7U, RCC100P, RCC1UP Express Water RO5DX, ROALK5D, ROUV10DCG, ROALKUV10M, RODI10D, ROELITE9, FLTSETS6C6G6I3M502 GeekPure RO5-AF, RO5-UV, RO5-PLUS Global Water RO-505 PureDrop RTW5 SimPure T1 Watts 415, and more. 100% Safe: Membrane Solutions filters have been certified by NSF and ISO9001. 10 Filters Included: 2 x Sediment Filter (PP) 2 x Granular Activated Carbon Filter (GAC) 2 x Carbon Block Filter (CTO) 1 x 100 GPD RO Membrane Filter (RO) 1 x Post Carbon Filter (T33） 2 x Alkaline Filter (ALK) 1st Stage – PP – Sediment Filter Works as the first barrier in the reverse osmosis system by removing solid particles like rust, sand, dirt and silt from the water and reducing a significant percentage of contaminants in the water. This prevents the other filters from getting clogged with fine particles and reduces the risk of damage to the other parts of the filtration system. Recommend replacing every 6 months (varies depending on the water source quality). 2nd Stage – GAC – Granular Activated Carbon Filter Protects your system from unpleasant chlorine, tastes, odors, cloudiness and colors. Also removes VOCs and other common chemicals from the water. Recommend replacing every 6 months (varies depending on the water source quality). 3rd Stage – CTO – Carbon Block Filter Protects your system from unpleasant chlorine, tastes, odors, cloudiness and colors. Also removes VOCs and other common chemicals from the water. Recommend replacing every 6 months (varies depending on the water source quality). 4th Stage – RO – 100 GPD RO Membrane Filter Rejects impurities down to 0.0001 microns, it can efficiently remove up to 99% of over 1,000 contaminants from your water, including heavy metals (primarily fluoride, calcium, magnesium, lead, colloids, chromium, and nitrates), organic, rubber mass, harmful minerals and another soluble salt. Recommend replacing every 2~3 years (varies depending on the water source quality). 5th Stage – T33 – Post Carbon Filter Removes any possible residual taste from the tank. Recommend replacing every 1 year (varies depending on the water source quality). Note: 1/4″ Quick Connector defaulted. If you need female thread connector, please send a picture to show your filter and fittings before setting order, we will help you. 6th Stage – ALK – Alkaline Filter Made with all-natural mineral resources, enhances your drinking water by boosting pH and Oxygen levels while adding essential minerals including calcium, potassium, magnesium, and more. Recommend replacing every 6 months (varies depending on the water source quality).