Therapy Jets/Blower

Spa Jet & Plumbing Standards

💧 Jet Performance Guidelines

Jet flow rates should be categorized as Standard or Upgraded:

Standard Jets: 10 GPM per jet

Upgraded / Therapeutic Jets: 15 GPM per jet

Use upgraded flow rates on luxury projects with therapeutic seating.

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📊 Pipe Sizing Based on Total Jet Flow

✅ Target Velocity Range

Pipe flow velocity should be between 6 and 8 feet per second

Use Hydraulic Charts and Tables (Pipe Sizing Chart) to ensure compliance

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🧮 Example:

10 Jets × 15 GPM = 150 GPM Total

→ Use 3" pipe for return loop (meets velocity criteria)

If total exceeds 190 GPM → Upsize to 4" pipe

🔍 No 3.5" pipe exists – jump from 3" to 4" as needed.

✅ Tip: Prefer to undersize flow (e.g., 5.8 ft/sec) than exceed 8 ft/sec.

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🔁 Spa Return Loop Standards

Standard Layout

3" Return Loop feeds all jets

1.5" Tees up to each jet group (1–3 jets per lateral)

Use symmetrical tee locations for balanced pressure

Pro Tip:

If you want water to travel in both directions around the loop, use a 2.5" or 3" trunk before teeing to 1.5" laterals.

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🌀 Spa Air Line System (Passive Venturi)

Use 2.5" looped airline, reduce to 1.5" at jets

Include Hartford loop 6" above waterline to prevent water entry

Offset vertical air risers from water risers for better gunite coverage

🛠️ Recommended Jet Body: Waterway 211-3040

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📏 Jet Height & Spacing

Table 5

Table 5

Jet Count

Heights from Floor

Notes

3 Jets

~7" / ~10" / ~13"

Triangle layout; allows closer spacing

2 Jets

~6" and ~12"

Stacked; requires wider spacing to avoid plate clash

1 Jet

~9–10"

Default back jet height

There are no rows in this table

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Jet cover plates are ~5" wide – maintain adequate clearance

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🫧 Champagne Spillover Configuration

Requires dedicated 4" trunk line that tees into (3) × 2" returns

Does not use spa jets

System is actuator-controlled and operates independently from spa mode

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📐 Drawing & Documentation Notes

For all spa plumbing drawings:

Clearly label loop diameter, tee sizes, and individual lines

Differentiate water vs. air lines

Show Hartford loops with elevations

Include lighting types, spa jet positions, and air intake routing

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Example from Moore Project:

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