What's the top-selling product within 3-4 people Reverse Osmosis Systems?

The top-selling product within 3-4 people Reverse Osmosis Systems is the <a href = "https://www.homedepot.com/p/ISPRING-6-Stage-Under-Sink-Reverse-Osmosis-Drinking-Water-Filter-System-with-Alkaline-Remineralization-NSF-Certified-RCC7AK/206467327" class="u__default-link"> ISPRING 6-Stage Under Sink Reverse Osmosis Drinking Water Filter System with Alkaline Remineralization, NSF Certified</a>.

Which brand has the largest assortment of 3-4 people Reverse Osmosis Systems at The Home Depot?

<a href = "https://www.homedepot.com/b/Plumbing-Water-Filters-Reverse-Osmosis-Water-Filters-Reverse-Osmosis-Systems/Matterhorn/3-4-people/12-mo/N-5yc1vZcdb1Zmz2Z1z1pcoeZ1z1pex9" class="u__default-link"> Matterhorn</a> has the largest assortment of 3-4 people Reverse Osmosis Systems.