Bathroom-count, GPM, plumbing-size, tank-size and pressure-drop guides for sizing whole-house water filtration.
Whole-house water filter sizing for two-bathroom homes by service flow, plumbing size and simultaneous demand.
Read guide →Whole-house sizingWhole-house water filter sizing for three-bathroom homes using GPM, service flow and peak household demand.
Read guide →Whole-house sizingWhole-house filter sizing for four-bathroom homes by GPM, connection size, service flow and peak demand.
Read guide →Flow sizingHow to size whole-house water-filter service flow in GPM from simultaneous fixture demand.
Read guide →Plumbing size comparison3/4-inch vs 1-inch whole-house filter plumbing compared for flow, pressure drop and installation.
Read guide →Tank sizingWhole-house carbon tank sizing by diameter, media volume, flow rate and bathroom count.
Read guide →High-flow sizingSizing whole-house filtration for rain showers, body sprays and high simultaneous bathroom demand.
Read guide →Prefilter sizingWhole-house sediment prefilter sizing by micron rating, housing size, pressure drop and particle load.
Read guide →Pressure sizingWhole-house filter pressure-drop sizing explained by service flow, dirty prefilters, plumbing restrictions and peak demand.
Read guide →Exact model sizingSpringWell CF1 vs CF4 compared by bathroom count, 9 vs 12 GPM service flow, tank size and installation.
Read guide →Exact model sizingRKIN CS8, CS9 and CS10 compared by bathrooms, 9/11/15 GPM service flow, peak flow and tank size.
Read guide →Large-home sizingSizing whole-house filtration for large homes with 7+ bathrooms, high service flow and 1.5-inch connections.
Read guide →Whole-House Filter Sizing & Flow covers products and decisions that can look similar on a product page while solving different problems in practice. Start by defining the water source, the symptom or contaminant you want to address, and whether the goal applies to one drinking-water tap or the entire home. That prevents a common mistake: choosing a highly rated product that uses the wrong treatment method for the actual problem.
Once the treatment method is clear, compare the specifications that control real-world performance. For point-of-use filters, that can mean certified contaminant claims, production rate, faucet flow and replacement-filter cost. For whole-house or well-water equipment, service flow, pressure drop, backwash requirements and incoming water chemistry matter more. For powered equipment, electrical requirements, operating cost and maintenance access belong in the buying decision from the beginning.
Technology names are useful starting points, not proof of performance. Activated carbon, catalytic carbon, reverse osmosis, ion exchange, UV and mechanical filtration each have known strengths, but finished products differ in media quantity, contact time, flow, design and certification scope. When a health-related contaminant drives the purchase, verify the exact model's performance documentation or certification rather than assuming every product in the category shares the same claims.
Also compare the full ownership cycle. Add replacement cartridges, media, lamps, salt, electricity, shipping and likely service over several years. A higher purchase price can be justified when consumables last longer and parts remain easy to source; a cheaper system can become more expensive when proprietary replacements are frequent or difficult to find. The guides above are organized to help move from diagnosis to a realistic shortlist rather than from a generic “best” list to an impulse purchase.