Buying Guides & FAQ

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Start here for Monster Mechanical buying help and water system selection guides.

Buying Guides & FAQ

All recommendations based on factual competitor and product data. No unverified claims.

1. How to Choose a Home RO System

What is Reverse Osmosis?

RO forces water through a semi-permeable membrane, removing up to 99% of dissolved contaminants including salts, heavy metals, bacteria, and chemicals.

Do You Need RO?

Your Water Source RO Recommended?
Municipal water with bad taste Yes — improves taste significantly
Borehole with high TDS (>500 ppm) Yes — reduces dissolved solids
Rainwater Usually not needed — UV + filtration sufficient
Municipal water, no issues Optional — nice to have for drinking water

What to Look For

  • GPD rating: 75GPD suits most households (1-4 people)
  • Pump included: Low-pressure homes need a pump-assisted model
  • Storage tank: Most home RO systems include a pressurised tank
  • Filter availability: Ensure replacement filters are available locally (Monster stocks these)

Monster Recommendation

5-Stage 75GPD Home RO System — R2,695

Best paired with the RO Annual Filter Pack — R595 for the first year's replacements.

2. When to Replace RO Filters

Component Replace Every Cost
Sediment pre-filter 6 months R59
Carbon pre-filter 6 months R129
RO membrane 1–3 years R495
Post-carbon filter 6–12 months Included in pack
Complete pack 6 months R595

Tip: Use a TDS meter (R249) to monitor membrane performance. Replace when rejection drops below 85%.

3. Big Blue Filter System Buying Guide

What is a Big Blue System?

A Big Blue system uses 20-inch large-diameter filter housings for whole-house or high-flow applications. The name comes from the blue housing colour used by most manufacturers.

When to Use a Big Blue System

  • Whole-house municipal water filtration
  • Borehole water pre-treatment
  • Rainwater filtration
  • High-flow commercial applications

System Options

Configuration Best For Price
2-Stage (sediment + carbon) Basic municipal improvement ~R2,500
3-Stage (sediment + carbon + polishing) Complete whole-house filtration R3,495
3-Stage + 55W UV Borehole/rainwater with bacterial safety R4,895

Cartridge Replacement

  • 20" Sediment Cartridge (5μ) — R195 — replace every 6 months
  • 20" Carbon Block — R349 — replace every 6-12 months

4. UV Sterilizer Buying Guide

How UV Sterilization Works

A UV sterilizer passes water past a germicidal UV-C lamp inside a quartz sleeve. The UV light damages DNA of bacteria, viruses, and parasites, rendering them unable to reproduce.

When You Need UV

  • Borehole water (bacteria risk)
  • Rainwater harvesting (bacteria risk)
  • Any untreated water source used for drinking
  • After a positive bacteria water test

Important: UV Only Works After Pre-Filtration

UV light cannot penetrate murky water. Always install sediment filtration before the UV sterilizer. Turbidity must be below 1 NTU for effective disinfection.

UV System Sizing

Flow Rate Needed UV Wattage Monster Product
Up to 40 L/min 55W 55W UV Sterilizer — R2,695
Higher flow rates 110W+ Contact us for sizing

Maintenance Schedule

Component Replace Every Cost
UV Lamp 12 months R649
Quartz Sleeve 2-3 years (or if cracked/cloudy) R695

5. Booster Pump Buying Guide

Standard vs VSD — Quick Decision Guide

Question Standard Booster VSD Booster
Budget under R6,000? ✅ ❌
Need constant pressure? ❌ Slight fluctuation ✅ Constant
Multiple bathrooms? OK for 1-2 ✅ Best for 2+
Energy efficiency priority? Standard ✅ Variable speed
Noise sensitive? Louder start/stop ✅ Quieter

Essential Accessories

Accessory Why You Need It Price
Automatic Pump Controller Auto start/stop + dry-run protection R995
Pressure Tank Reduces pump cycling, longer pump life VERIFY
Non-Return Valve Prevents backflow VERIFY

6. Drainage vs Sewage vs Cutter Pump Guide

Pump Type Handles Max Solids Typical Use Monster Price
Drainage Pump Clean/slightly dirty water Small particles only Flooded basements, pool draining, sump pits R3,495
Sewage Pump Dirty water with solids Up to ~35mm solids Sewage lifting, waste water, septic R5,995
Cutter Pump Sewage with fibrous material Cuts solids via blade Heavy-duty sewage, wipes, fibrous waste R8,995

Quick Decision

  • Flooded basement / clean water? → Drainage pump
  • Toilet/sewage waste? → Sewage pump with float
  • Rags, wipes, tough waste? → Cutter pump

7. Borehole Water Treatment Basics

Step-by-Step Process

  1. Test your water — TDS meter (R249) + lab test for bacteria
  2. Pre-filter sediment — Big Blue sediment cartridge
  3. Remove taste/odour — Carbon block filtration
  4. Kill bacteria — 55W UV sterilizer (essential)
  5. Optional: RO — For drinking water if TDS is high

Recommended Starting Kit

Borehole/Rainwater Filtration Kit — R5,995

Includes sediment filtration, carbon filtration, and UV sterilization components.

8. TDS Meter — What the Numbers Mean

TDS Reading (ppm) Water Quality Action
0–50 Excellent (RO-purified) No action needed
50–300 Good (typical municipal) Standard filtration sufficient
300–500 Fair Consider RO for drinking water
500–1000 Poor RO recommended
1000+ Unsafe for drinking RO essential

Product: TDS Meter / Water Test Kit — R249

Note: TDS does not measure bacteria. A separate bacteria test is needed for borehole and rainwater sources.

Monster Mechanical — Engineering-backed advice. Buy the correct product the first time.