Why give two resin sizing numbers (11.11 ft³ and 33.33 ft³)?

Those are example resin volumes to handle daily loads if regeneration is done once every 24 hours — 11.11 ft³ handles 300 mg/L hardness; 33.33 ft³ handles 900 mg/L. For continuous service we normally recommend two trains or a lead/lag arrangement.

What salt quality is recommended?

Use industrial-grade NaCl with ≥95% purity, stored dry. Avoid salt with high insoluble matter to prevent brine tank issues.

Will this protect an RO downstream?

Yes — softening to <1–5 mg/L hardness significantly reduces scaling risk on RO membranes. We still recommend antiscalant dosing and periodic monitoring.

3000 LPH Water Softener Plant Price

Working Principle

The water softener uses strong-acid cation (SAC) resin in sodium form. Hardness ions (Ca²⁺ & Mg²⁺) are exchanged with Na⁺ on the resin. When resin capacity is exhausted, automatic regeneration (brine backwash & rinse) restores sodium form and the softener comes online again without manual intervention.

Design Assumptions

Permeate (soft water) required = 3,000 LPH (continuous 24 hr basis → 72.0 m³/day)
Accepted inlet hardness range = 300 mg/L to 900 mg/L (as CaCO₃)
Resin working capacity (assumed conservative) = 30,000 grains/ft³ (typical strong-acid cation resin; final vendor selection may vary)
Regeneration frequency assumed = once per day (can be extended to 2–3 days by increasing resin volume)
Salt dosage per regeneration assumed = 10 lbs/ft³ ≈ 4.536 kg/ft³ (typical industry practice; final will depend on resin & site)
1 grain = 64.79891 mg (used in grain ↔ mg conversions)

Sizing Calculations — Step by step (digit-by-digit)

Goal: calculate required resin volume (in ft³ and m³) to handle worst-case hardness = 900 mg/L with regeneration once per day. We show 300 mg/L and 900 mg/L examples.

Common conversions used

1 grain = 64.79891 mg Resin capacity (assumed) = 30,000 grains/ft³ Resin capacity (mg per ft³) = 30,000 × 64.79891 = 1,943,967.3 mg/ft³ 1 ft³ = 0.0283168 m³

Step A — Daily soft water volume

Permeate = 3,000 LPH → convert to m³/hr: 3,000 ÷ 1000 = 3.0 m³/hr.
Daily volume = 3.0 m³/hr × 24 hr = 72.0 m³/day = 72,000 L/day.

Permeate_m3hr = 3,000 ÷ 1000 = 3.0 m³/hr Permeate_m3day = 3.0 × 24 = 72.0 m³/day Permeate_Lday = 72.0 × 1000 = 72,000 L/day

Step B — Total hardness mass to remove per day

We compute for BOTH hardness values you asked (300 mg/L and 900 mg/L). 1) For 300 mg/L: Hardness_mass_300 (mg/day) = 72,000 L/day × 300 mg/L = 21,600,000 mg/day.
Convert to grams: 21,600,000 ÷ 1000 = 21,600 g/day = 21.6 kg/day. 2) For 900 mg/L: Hardness_mass_900 (mg/day) = 72,000 × 900 = 64,800,000 mg/day.
Convert to grams: 64,800,000 ÷ 1000 = 64,800 g/day = 64.8 kg/day.

Hardness_300_mg_day = 72,000 × 300 = 21,600,000 mg/day → 21,600,000 ÷ 1000 = 21,600 g/day = 21.6 kg/day Hardness_900_mg_day = 72,000 × 900 = 64,800,000 mg/day → 64,800,000 ÷ 1000 = 64,800 g/day = 64.8 kg/day

Step C — Resin capacity in mg per ft³ (digit-by-digit)

Resin_capacity_grains = 30,000 grains/ft³ (assumed)
1 grain = 64.79891 mg → Resin_capacity_mg = 30,000 × 64.79891 = 1,943,967.3 mg/ft³

Resin_capacity_mg = 30,000 × 64.79891 = 1,943,967.3 mg per ft³

Step D — Required resin volume (ft³)

Resin_volume_ft3 = Hardness_mass_mg_per_day ÷ Resin_capacity_mg_per_ft3 (assuming one regeneration per day) 1) For hardness 300 mg/L: Resin_volume_300_ft3 = 21,600,000 ÷ 1,943,967.3 ≈ 11.111 ft³ 2) For hardness 900 mg/L: Resin_volume_900_ft3 = 64,800,000 ÷ 1,943,967.3 ≈ 33.333 ft³

Resin_vol_300 = 21,600,000 ÷ 1,943,967.3 = 11.111... ft³ Resin_vol_900 = 64,800,000 ÷ 1,943,967.3 = 33.333... ft³

Step E — Convert ft³ → m³ (and litres)

1 ft³ = 0.0283168 m³ 1) 11.111 ft³ → m³: 11.111 × 0.0283168 = 0.31463 m³ ≈ 314.6 L 2) 33.333 ft³ → m³: 33.333 × 0.0283168 = 0.94389 m³ ≈ 943.9 L

Resin_vol_300_m3 = 11.111 × 0.0283168 = 0.31463 m³ = 314.63 L Resin_vol_900_m3 = 33.333 × 0.0283168 = 0.94389 m³ = 943.89 L

Step F — Salt (NaCl) required per regeneration (approx.)

Assumed salt dosage = 10 lbs/ft³ ≈ 4.536 kg/ft³ (industry typical; final depends on resin & vendor). 1) For 11.111 ft³ → salt_300 = 11.111 × 4.536 = 50.4 kg per regeneration (approx). 2) For 33.333 ft³ → salt_900 = 33.333 × 4.536 = 151.2 kg per regeneration (approx).

Salt_per_ft3_kg = 10 lbs × 0.453592 = 4.53592 kg ≈ 4.536 kg/ft³ Salt_300_kg = 11.111 × 4.536 = 50.4 kg Salt_900_kg = 33.333 × 4.536 = 151.2 kg

Interpretation & recommended practical arrangement: To support variable hardness up to 900 mg/L and ensure redundancy, we recommend either:

Use TWO identical softener trains (lead + standby) each sized ~18 ft³ resin (~0.51 m³) and alternate regeneration (this allows continuous supply during regeneration), or
One single large vessel containing ~33.5 ft³ resin (≈0.944 m³) with an automatic valve — but note regeneration will take the vessel offline during brining; so a dual-train is preferred for continuous service.

Scope of Supply

FRP pressure vessel(s) with internal resin bed — sized per above (we give 2-train & single-train options)
Automatic Multi-Port Valve (Auto-MPV) with timer / meter regen options (digital control)
Brine tank (HDPE) sized to store salt for multiple regenerations
Strong-acid cation resin (SAC), pre-loaded
Brine dosing system, salt grid & injector
Feed strainer, pressure gauges, sample ports, inlet/outlet piping (UPVC/HDPE/SS), bypass, drain piping
Control panel with manual/auto mode, level sensors for brine tank
Installation, commissioning, operator training & initial resin performance test

Operation & Regeneration Details

Regeneration cycle (typical): Backwash → Brine draw (slow rinse) → Fast rinse → Refill brine tank (if equipped) → Return to service.
Regeneration triggers: Time-based (once/day) or meter-based (m³ treated) — meter-based is recommended for variable hardness loads.
Backwash flow rate: ~ 50–70 L/min/m³ of resin (vendor to confirm) to remove suspended solids from resin bed.
Brine concentration: Typically 10–12% NaCl solution prepared in brine tank.
Salt handling: Recommend quality industrial salt (NaCl) with ≥ 95% purity and dry storage in brine room.

Applications & Why Choose This Softener

Protects boilers, heat exchangers, chillers and process equipment from scale
Improves detergent efficiency in laundries and hospitality operations
Extends life of RO membranes when softening used as pre-treatment
Auto-MPV & brine tank enable automatic, low-maintenance regeneration
FRP vessels provide corrosion resistance and low maintenance

Expected Performance & Quality Control

Post-softener hardness typically < 1–5 mg/L (depending on regeneration performance & resin quality). We provide commissioning test: inlet/outlet hardness profile, salt usage verification, and service & AMC options to maintain consistent performance.

Parameter	Typical Value
Design flow	3,000 LPH (72 m³/day)
Hardness range handled	300 – 900 mg/L (as CaCO₃)
Typical outlet hardness	< 5 mg/L (target, after proper regen)
Resin (example)	SAC, 30,000 grains/ft³ (vendor resin available)

Operation & Maintenance

Daily: check inlet pressure, outlet hardness, brine tank level, Auto-MPV status
Weekly: inspect brine tank salt level, clean strainer, check drain lines
Monthly: record salt consumption, verify resin performance via sample tests
Annual: resin performance audit and possible partial replacement after several years depending on feed & fouling
We provide commissioning, resin warranty (as per vendor), spares & AMC packages

Item	Note
FRP Vessel	Diameter & height per resin ft³ (quote)
Auto-MPV	Timer and/or meter based regeneration
Brine Tank	Sized for multiple regenerations (quote)
Resin	SAC — preloaded or charged on site

3000 LPH Water Softener Plant — FRP Vessel (Auto MPV + Brine Tank)

Quick Summary