Hi,
You may consider an outdoor filter by using 5 x 20" PP filter cartridges
Housing : Stainless steel 304
Pressure: up to 100 psi
Cost: RM1300 - 1500 (including installation)
Maintenance frequency: 6 months (about RM100) or DIY by replacing the filter cartridges (RM10 x 5)
More efficient with reasonable maintenance cost.
Low pressure drop compare to membrane filter.