1. Set the shutoff valve on the connection unit to the closed position, and then open the clean water faucet to discharge any pressure. 

2. Press the button above the cartridge, and then rotate the used conditioning filter cartridges К5 and (or) К2 in a clockwise direction to remove the used cartridge. 

3. Install the new conditioning cartridges К5 and (or) К2

4. Press the button above the cartridge, and then rotate the membrane cartridge in a clockwise direction to be able to remove it. 

5. Install the service cap instead of the membrane cartridge 

6. Set the shutoff valve on the connection node into the open position.

7. Open the clean water faucet and flush the preliminary water treatment cartridges for about  20–30 minutes. 

8. Set the shutoff valve on the connection node  into the closed position. 

9. Install the membrane cartridge instead of the service cap. 

10. Interchange the positions of K5 and K2 cartridges.

11. Set the shutoff valve on the connection node into the open position and close the clean water faucet.

12. Make sure that RO-101 connections are sealed.