How to Cover the Pool for Winter

Introduction

Covering the pool during winter is one of the most important decisions to protect your investment. An adequate cover prevents damage, reduces maintenance costs and makes reopening in spring easier.

In Margem Sul, despite the relatively mild winters, prolonged exposure to the elements can cause significant problems: debris accumulation, algae proliferation, equipment damage and unnecessary consumption of chemicals.

This guide explains the types of covers available, how to choose the most suitable one and how to install it correctly for maximum protection.

Why Cover the Pool in Winter

Benefits of Coverage

Costs of Not Covering

Types of Winter Covers

Mesh Covers

Advantages:

• Economical
• Light and easy to handle
• Allows natural drainage
• Doesn't accumulate water on top

Disadvantages:

• Doesn't completely block light
• Fine debris can pass through
• Lower durability
• Doesn't offer thermal insulation

Solid Covers (Opaque)

Advantages:

• Total light blocking (no algae)
• Complete protection against debris
• Good thermal insulation
• Greater durability

Disadvantages:

• Needs pump for water on top
• Heavier
• Can form water pockets
• Requires more maintenance

Safety Covers

Advantages:

• Maximum safety (children, animals)
• Very durable (10-15 years)
• Aesthetically pleasing
• Easy opening/closing

Disadvantages:

• High initial cost
• Requires anchor installation
• Professional installation recommended

Automatic Covers

Advantages:

• Maximum convenience
• Daily use possible
• High safety
• Excellent thermal insulation

Disadvantages:

• Very high cost
• Motor maintenance
• Requires specific installation

Choosing the Right Cover

Factors to Consider

Recommendations by Situation

Sizing

Preparation Before Covering

Winterisation Checklist

Water:

• [ ] Adjust water level (10-15 cm below jets)
• [ ] Do shock treatment
• [ ] Balance pH (7.2-7.6)
• [ ] Add long-lasting algaecide
• [ ] Add winterising product

Equipment:

• [ ] Clean filter (backwash)
• [ ] Drain pump
• [ ] Drain pipes (if frost risk)
• [ ] Turn off heat pump
• [ ] Protect exposed equipment

Pool:

• [ ] Vacuum floor
• [ ] Brush walls
• [ ] Clean waterline
• [ ] Remove accessories (ladders, etc.)
• [ ] Install floats or air pillows

Correct Water Level

Air Pillows

Step-by-Step Installation

Mesh or Solid Cover

Anchor Installation

Recommended spacing:

• Straight sides: 90-100 cm between anchors
• Corners: 3 anchors per corner
• Curves: More anchors, smaller spacing

Correct Tension

Maintenance During Winter

Regular Checks

Removing Accumulated Water

For solid covers:

Damage Prevention

Removal in Spring

Removal Procedure

Cleaning and Storage

Special Situations in Margem Sul

Pine Trees (Aroeira, Verdizela)

Coastal Areas (Costa Caparica)

Estates and Rural Areas (Azeitão, Palmela)

Costs and Durability

Investment by Type

Cost-Benefit

*Estimate of additional costs without cover

Winter Cover Checklist

Before Covering

• [ ] Water treated and balanced
• [ ] Equipment drained
• [ ] Pool clean
• [ ] Correct water level
• [ ] Air pillows installed
• [ ] Accessories removed

During Installation

• [ ] Cover centred
• [ ] All fixings secure
• [ ] Adequate tension
• [ ] No exposed areas

During Winter

• [ ] Weekly debris check
• [ ] Water removal (if solid)
• [ ] Inspection after storms
• [ ] Fixings check

On Removal

• [ ] Water removed from top
• [ ] Debris cleaned
• [ ] Careful removal
• [ ] Cover cleaned
• [ ] Complete drying
• [ ] Proper storage

Frequently Asked Questions

Can I use a normal tarp as a cover?

Not recommended. Normal tarps don't have UV resistance, adequate fixing systems or necessary durability. They can also be unsafe and tend to deteriorate quickly, releasing fibres into the water.

Is the bubble cover suitable for winter?

The bubble (solar) cover is excellent for conserving heat during swimming season, but is not suitable for winterisation. It doesn't offer protection against debris, doesn't support weight and deteriorates quickly with prolonged exposure without use.

Do I need to lower the water level?

Yes, it's recommended to lower 10-20 cm below the skimmer jets. This prevents frost damage (rare in Margem Sul, but possible), allows correct cover installation and protects surface equipment.

How long can the pool stay covered?

In Margem Sul, typically from November to March/April. There's no problem keeping it covered during this period, provided the water was correctly treated before covering and periodic checks are made.

Is the safety cover really safe?

Certified safety covers (AFNOR NF P90-308 standard) are designed to support the weight of a child or adult who accidentally falls. However, no cover replaces adult supervision. They are an additional layer of protection, not a substitute for vigilance.

Conclusion

Covering the pool in winter is a smart investment that:

• Protects against debris and algae
• Saves on chemicals and water
• Facilitates spring reopening
• Prolongs lining lifespan
• Offers additional safety (suitable models)

Choose the cover suitable for your budget and needs, install correctly and do regular maintenance during winter. In spring, your pool will be ready for the new season with much less work.

If you need professional help winterising your pool in Margem Sul, ManutençãoPiscinas is here to help. Contact us for a no-obligation quote.