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  • New for 2024
  • Air Pumps and Accessories
  • Aquatic Plant Care
  • Artificial Rocks
  • Aquariums
  • Bottom Drains
  • Cleaning Equipment
  • Filter Media and Bags
  • Filter Systems
  • Fire Pits
  • Fish Food and Feeders
  • Fish Health
  • Fish Holding and Measuring Tanks
  • Fish Nets and Cages
  • Fountains and Basins
  • Fountains and Nozzles
  • Heaters and De-Icers
  • Lake Management
  • Landscape Lighting
  • Plumbing and Auto-Fills
  • Pond Decorations
  • Pondless Kits and Parts
  • Pond Kits
  • Pond Lighting and Electronics
  • Pond Liner and Sealants
  • Pond Netting & Stakes
  • Predator and Pest Control
  • Pump Accessories
  • Pumps - External
  • Pumps - Submersible
  • Seasonal Products
  • Skimmers for Ponds
  • Ultraviolet Clarifiers
  • Water Testing
  • Water Treatments
  • Waterfall Filters
  • Waterfall Spillways and Basins
  • Gifts and Collectibles
  • Shop All

    • Shop by Brand

  • Aquascape
  • EasyPro
  • Atlantic
  • Matala
  • Blue Thumb
  • Lifegard Aquatics
  • Alliance
  • Anjon
  • Outdoor Water Solutions
  • Microbe-Lift
  • View all Brands

    • Water Treatments

    Underwater Warehouse highly recommends testing your pond water regularly, to ensure it remains a safe and healthy home for your fish. Testing of levels such as pH, ammonia, and nitrite can help you determine whether you may be overfeeding, and alert you to any potential issues early, when they are more easily treatable. If your water tests show that any of your water parameters are very high or very low, it is important to take steps to correct conditions for fish health and wellbeing. Monitoring the water chemistry of the aquarium or pond will allow you to catch problems before they develop.

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