Cost of tap water as per Saldanha Bay Municipality
0-6 kilo litres R8.00 excl. VAT
7-40 kls R9.50 excl. VAT R10.83 including VAT
Based on this price, we concluded the following:
R10.83/1000L = R0.01 per litre municipal water.

ULTRA FILTRATION FILTER SERVICE COSTING PER ANNUM

3 Months – R50 (Sediment)
6 Months – R190 (Sediment, carbon, GAC)
9 months – R50 (Sediment)
12 Months – R805 (Sediment, carbon, GAC, Taste and Odour, Ultra Filtration membrane)

Total UF annual maintenance cost: R1095.00

Say a person uses 10 litres per day worst case scenario = 3650litres per year
3650 filtered UF litres per year = 3650x1c= R36.50
Annual Water + Annual Maintenance = R1131.50
R36.50 + R1095.00 = R1131.50
Divided by the 3650 litres for the year = R0.31 per litre for UF filtered water 

REVERSE OSMOSIS FILTER SERVICE COSTING ANNUM

3 Months – R50 (Sediment)
6 Months – R190 (Sediment, carbon, GAC)
9 months – R50 (Sediment)
12 Months – R310 (Sediment, carbon, GAC, Taste and Odour)
Every 3 years RO Membrane R550.00/3=R183 per annam.

Total RO annual maintenance cost: R783.00

Say a person uses 10 litres per day drinking water, worst case scenario = 3650litres per year
3650 filtered litres per year = 3650x1c= R36.50
PLUS the 3 litres waste water per litre 3650x3c = R109.50
Annual water + Annual Waste + Annual Maintenance = R929.00
R36.50 + R109.50 + R783.00 = R929.00
Divided by the 3650 litres for the year = R0.25 per litre for UF filtered water 

CONCLUSION

Its cheaper and healthier to go with a Reverse Osmosis Purification System. The 1kilo litre of waste will be welcomed on the garden during our dry summers. Or donate it to dry gardens somewhere.