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Support & Maintenance

Muriatic Acid for Hot Tubs and Pools: Safe Use, UK Rules and Alternatives

Posted on December 6, 2023September 28, 2026 by buildahottub
Gloved hands carefully pouring pH reducer from a measuring jug into a bucket of water beside a hot tub, with safety goggles on the side
06
Dec

Muriatic acid is hydrochloric acid, and it’s very good at lowering pH and alkalinity, but it’s hazardous and needs a licence in the UK above 10%. Here’s how to use it safely and when pH minus is the better choice.

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Posted in Support & Maintenance
Cocktail & Plunge Pool Related

Plunge Pool: Everything You Need to Know (Sizes, Costs, Safety and DIY)

Posted on December 5, 2023September 28, 2026 by buildahottub
Small tiled in-ground plunge pool with steps in a back garden
05
Dec

Everything you need to know about plunge pools: sizes, types, what they cost in the UK and USA, safety, heating or using one as a cold plunge, water care and building your own.

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Posted in Cocktail & Plunge Pool Related
Support & Maintenance

Cyanuric Acid in a Hot Tub: Why You Want It As Low As Possible

Posted on November 20, 2023September 28, 2026 by buildahottub
Hot tub test strip with a cyanuric acid pad held against the colour chart on the bottle beside a hot tub
20
Nov

Cyanuric acid protects chlorine in outdoor pools, but in a covered hot tub it just slows chlorine down. Here’s where it comes from, what level to aim for and how to get rid of it.

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Posted in Support & Maintenance
Support & Maintenance

Backyard Swim Spa: Everything You Need to Know (Sizes, Costs and DIY)

Posted on November 19, 2023September 28, 2026 by buildahottub
Swim spa set into a timber deck in a back garden, with the swim current area and seating visible
19
Nov

What a backyard swim spa is, how big they are, whether to buy or build one, and what to plan for: the base, electrics, access, permits, running costs and water care.

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Posted in Support & Maintenance
Cocktail & Plunge Pool Related

What Is a Spool? The Spa-Pool Hybrid Explained (Sizes, Costs and DIY)

Posted on November 18, 2023September 28, 2026 by buildahottub
Tiled spool, a small heated pool with bench seating and jets, in a back garden
18
Nov

A spool is a small pool with hot tub features like heating and jets. Here’s how it compares with a pool, hot tub and plunge pool, what size it should be, what it costs and how to build one.

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Posted in Cocktail & Plunge Pool Related
DIY Hot Tub Building

How to Make a DIY Hot Tub Cover: Niel’s Fibreglass and Epoxy Hard Top

Posted on November 17, 2023September 28, 2026 by buildahottub
DIY Hot Tub Cover
17
Nov

How Niel built a two-piece hard top hot tub cover from timber, foam, fibreglass and epoxy for about £700, step by step, with his top tips and what to think about before making your own.

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Posted in DIY Hot Tub Building
Cocktail & Plunge Pool Related

Ben’s DIY Concrete Plunge Pool in Pennsylvania (Case Study)

Posted on October 14, 2023September 28, 2026 by buildahottub
DIY Concrete Plunge Pool
14
Oct

Ben in Pennsylvania planned, dug, formed and poured his own concrete plunge pool, and added a clever dog grate. Here’s his build from start to finish.

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Posted in Cocktail & Plunge Pool Related
Case Studies / Example Projects

Scott’s Custom DIY Hot Tub in Texas (Case Study)

Posted on October 5, 2023September 28, 2026 by buildahottub
Scott Texas
05
Oct

Scott in Texas had the building skills but wanted the plumbing, parts and spa pack set-up done right. Here’s how his custom DIY hot tub came together.

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Posted in Case Studies / Example Projects
Design / Ideas Related

Ground Bonding a Hot Tub or Plunge Pool: What It Is and Do You Need It?

Posted on September 18, 2023September 28, 2026 by buildahottub
Solid copper bonding conductor clamped to tied steel rebar in the floor of an in-ground hot tub before the concrete is poured
18
Sep

Equipotential bonding isn’t the same as grounding, and on a DIY hot tub or plunge pool part of it has to go in before you pour. Here’s what NEC 680.26 and BS 7671 require and what to ask your electrician.

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Posted in Design / Ideas Related
Case Studies / Example Projects

Stock Tank Hot Tub Kit: How Ben Built His DIY Stock Tank Hot Tub in California (Case Study)

Posted on September 14, 2023September 28, 2026 by buildahottub
DIY Stock Tank Hot Tub Kit
14
Sep

Ben built a heated, jetted stock tank hot tub for his California Airbnb using one of my stock tank hot tub kits. Here’s how he did it, and what’s in the kit.

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Posted in Case Studies / Example Projects
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