How to Clear Cloudy Water in Above Ground Pools

Above Ground Pools
May 25
3 min read

Updated: Jun 23

Above ground pools follow the same core principles as in-ground pools. However, there are a few important tweaks, especially around filtration type, pool material (vinyl or metal walls), and seasonal use. Here’s a step-by-step guide to clear cloudy water in your above ground pool.

Understanding Your Above Ground Pool

Before diving into specific solutions, it's crucial to understand the unique features of above ground pools. These pools have a distinct structure and filtration system that requires different maintenance techniques compared to in-ground options. They may be smaller, often using cartridge or small sand filters. Seasonal use also impacts how you maintain water quality.

Step-by-Step Guide to Clear Cloudy Pool Water

1. Test and Balance Your Water Chemistry

Test pH and Total Alkalinity

Ideal pH: 7.2 to 7.6
Ideal Total Alkalinity: 80 to 120 ppm

Start with a high-quality liquid test kit or test strips. If your pH exceeds 7.6, chlorine becomes less effective. On the other hand, if it’s below 7.2, the water can irritate skin and eyes and corrode metal parts.

Adjusting pH and Alkalinity:

To raise pH/alkalinity: Add sodium bicarbonate (baking soda) or a commercial alkalinity increaser.
To lower pH: Add muriatic acid or sodium bisulfate. Follow label directions carefully!

2. Shock (Super-Chlorinate) the Pool

Proper chlorine levels are crucial due to smaller pumps and filters in above ground pools.

Choose Your Shocking Agent:

Sodium Dichlor (granular): Dissolves quickly, pH-neutral.
Calcium Hypochlorite (Cal-Hypo): Very strong, raises calcium hardness.
Liquid Chlorine (Sodium Hypochlorite): Effective, but ensure you're aware of added stabilizer levels.

Calculate Dosage:

One rule of thumb: to raise free chlorine by 10 ppm, add about 1 lb (0.45 kg) of 65% cal-hypo per 10,000 gallons. For dichlor, follow label dosing, which is roughly 1 lb per 10,000 gallons for an increase of 8–10 ppm.

How to Shock:

Shock in the evening or late afternoon. Sunlight destroys free chlorine quickly.
Pre-dissolve in a bucket of pool water if the label recommends doing so.
Distribute the solution around the pool with the circulation running.

3. Inspect and Clean Your Filter

A clean filter is essential for clear water.

Cartridge Filter Maintenance:

Turn off the pump and close any valves.
Release pressure and remove the filter top.
Hose off every pleat of the cartridge thoroughly.
Deep clean: Soak cartridges in a filter-cleaning solution as needed.

Sand Filter Maintenance:

Backwash until the sight glass runs clear (about 2-3 minutes).
Rinse on the “Rinse” setting for 30 seconds.

4. Use a Clarifier or Flocculant

If your chemistry is balanced but the water remains cloudy, microscopic particles may still be suspended.

Pool Clarifier:

Function: Aggregates tiny particles into larger ones that your filter can catch.
Usage: Run the pump while pouring the clarifier around the pool.

Pool Flocculant:

Function: Gathers fine debris into large clumps that sink to the bottom.
Usage: Only if clarifier isn't enough—add floc to the skimmer and turn off the pump.

5. Physical Cleaning and Debris Removal

Debris is a common issue in above ground pools.

Skim Daily: Remove debris with a fine-mesh leaf net.
Brush Pool Walls and Floor: Use a nylon-bristle brush, focusing on corners and seams.
Vacuum Regularly: Even if you have an automatic cleaner, manual vacuuming is beneficial.

6. Optimize Circulation

Maximize turnover to improve water clarity.

Run Your Pump 8–12 Hours/Day: During hot weather and after treatments.
Check All Valves and Skimmer Lines: Ensure proper water flow.
Inspect for Air Leaks: Air bubbles in return jets may indicate a leak.

7. Address Specific Above Ground Pool Issues

Consider the specifics of your pool.

Liner Material: Always use nylon brushes on vinyl.
Seasonal Open and Close: Flush out winterizing chemicals, balance chemistry, and shock immediately.

8. Preventive Tips to Avoid Future Cloudiness

Consistent Testing Routine: Test pH, chlorine, alkalinity twice a week in warm months.
Shock Weekly: Especially during peak season.
Use a Cover: A snug cover reduces debris and protects chlorine.
Don’t Overload with Swimmers: Too many swimmers can quickly reduce chlorine levels.
Maintain Filter Media: Replace cartridges or sand as necessary.

9. Quick Checklist When Cloudiness Appears

Test water with a full test kit.
Balance pH and alkalinity.
Shock the pool.
Clean or backwash the filter.
Use clarifier or flocculant as needed.
Brush and vacuum to remove settled particles.
Run the pump until clear.
Inspect for broken equipment.

Conclusion

By following these above-ground specific steps, you can maintain crystal clear water. Remember to balance chemistry, shock the pool, clean filters, and carry out regular maintenance. Following this guide, you should have clear, sparkling water in no time!