D.E. Filters for Pools: How They Work and Are They Better than Sand Filters?

When it comes to pool equipment, one of the most crucial pieces is the pool filter. Choosing the right type can make a big difference in your pool’s cleanliness, and with so many options available, it can be hard to know which one is best for you. One of the most powerful types of pool filters? The Diatomaceous Earth (D.E.) filter.

If you’re considering investing in a D.E. filter, this guide will walk you through how it works, the maintenance it requires, and how it compares to sand filters to help you make an informed choice.

How Does a D.E. Filter Work?

A D.E. filter uses diatomaceous earth as the primary filtering agent. Diatomaceous earth is a fine powder derived from fossilized remains of diatoms, tiny aquatic organisms high in silica. The powder is typically added to the filter, where it coats a grid or set of “fingers” within the filter tank. This D.E. “cake” catches even the smallest particles as water passes through, offering the highest level of filtration compared to sand and cartridge filters.

Over time, D.E. powder becomes saturated with debris, and cleaning is necessary to keep the filter effective. Cleaning involves backwashing, which reverses the water flow to flush out trapped particles, and adding fresh D.E. powder. Occasionally, the filter grid will need more thorough cleaning, like rinsing with a hose or soaking in a cleaning solution to dissolve oils and minerals.

D.E. Filters vs. Sand Filters: Which One is Better?

Both D.E. filters and sand filters remove contaminants to keep your water clean, but they do so in different ways and at different levels of filtration.

1. Filtration Quality:

   • A D.E. filter captures particles as small as 1 to 6 microns, making it the most effective type of pool filter. It can catch tiny contaminants like cosmetic residues or skin cells that may pass through sand filters.
   • Sand filters, on the other hand, can filter particles between 20 to 40 microns, which may not trap smaller particles as effectively.

2. Maintenance:

   • D.E. filters require more upkeep, including frequent backwashing and D.E. powder replacement. They also need periodic disassembly for a deep clean, where grids are rinsed or soaked.
   • Sand filters have simpler maintenance, requiring just occasional backwashing and sand replacement every 4-5 years.

3. Cost and Complexity:

   • D.E. filters come with a higher initial cost and are a bit more involved to maintain. However, their superior filtration can lead to cleaner water, which helps preserve other pool equipment.

4. Efficiency:

   • Due to their high filtration quality, D.E. filters may need to run less often than sand filters to achieve the same water clarity, which can reduce energy costs.

Types of D.E. Filters

1. Grid D.E. Filters: These filters use either a panel grid design or vertical fingers to create a balanced water flow for maximum filtration. Grid D.E. filters tend to be straightforward to clean and maintain.

2. Quad D.E. Filters: These filters are built like cartridge filters and use four cylindrical grids, providing a large filtration surface. The quad design allows for higher water flow rates and longer times between cleanings.

Key Considerations When Choosing a D.E. Filter

1. Pool Type and Size: Make sure the filter is compatible with your pool type—whether inground or above ground—and sized to handle your pool’s volume. For instance, an inground pool might benefit from a larger capacity D.E. filter with higher flow rates.

2. Filter Size and Turnover Rate: For effective cleaning, your filter needs to process your pool’s full volume at least once per day. Larger pools need higher flow rates and larger filters to keep water clear.

3. Filter Valve Type: D.E. filters often come with either a multiport valve or a simpler push/pull valve. Multiport valves offer additional settings (like "Rinse" and "Winterize") that make maintenance easier, though they require more attention than push/pull options.

4. Cleaning Requirements: Although more demanding than sand filters, D.E. filters are manageable with a consistent maintenance routine. Regular backwashing and occasional grid cleaning will keep it running smoothly and effectively.

5. Tank Construction: D.E. filter tanks are commonly built with durable materials like ABS thermoplastic or fiberglass-reinforced polypropylene, both of which resist corrosion and can withstand exposure to water for years.

Frequently Asked Questions

1. What does “D.E.” stand for in D.E. Filter?
D.E. stands for diatomaceous earth, which consists of fossilized aquatic organisms that create an ultra-fine powder used in pool filtration.

2. How much does a new D.E. filter cost?
A new D.E. filter costs between $500 and $2,000, depending on size and model. This high-performance filtration system may have a higher upfront cost but results in cleaner water and may extend the life of your other pool equipment.

3. Can I add D.E. powder to a sand filter?
Yes, you can add a small amount of D.E. powder to a sand filter to temporarily enhance filtration. However, adding too much can cause clogging and damage your filter system, so proceed with caution and follow the manufacturer’s guidelines.

4. Which is better: a D.E. filter or a cartridge filter?
D.E. filters provide the highest filtration level, while cartridge filters are easier to maintain and may be a better fit for budget-conscious pool owners who prioritize simplicity over filtration precision.

Get the Cleanest Water with AQUASTRONG

For optimal pool care, investing in a high-quality filter tailored to your needs is essential. At AQUASTRONG, we prioritize equipment that makes pool maintenance easy and effective, helping you keep your water crystal clear. A D.E. filter may require more upkeep, but for pool owners dedicated to pristine water quality, it’s well worth the investment.

For more pool maintenance tips and equipment options, explore our resources at AQUASTRONG.