The under sink job I explained has on board pump, it is a little slow on its own, but it fills a small pressure tank, bout 2 1/2 - 3 gallons. The tank come factory charge at 6 psi, but you can up the charge to up the pressure if need be.
We were using a flow jet for the ice maker and add on sink faucet for drinking water, just disconnected the flo-jet and connected this, better pressure than the flow jet even.
And Maria can wash veggies with clean water without worrying about the cost of bottled water.
We are family of 5, and bottled water use had exceeded 7 bottles per week, more than 1 per day, so this system pays for itself in less than 6 months and no more hassle ringing in 8 - 9 full bottles and the same in empties every weekend.
No more cleaning the bottle neck and changing out the empty everyday, some times 2 times in the day.
Well worth it.