Filter basics:

Filtration is simply the mechanical process by which suspended solids are removed from water. The solids are removed over a period of time as they pass through the filter and particles become trapped within the filter membrane or element.

The Mistral Micro-Clean System is such that the water turns over 2-4 times the turn over rate recommended by ANSI and the NSF and in addition the system will purge twice a day, creating turbulence for a few minutes which agitates the water and increases the over all effectiveness of the filtration.

According to ANSI American National Standard for portable Spas and the National Sanitation Foundation, the hot tub should be designed to turn over the entire spa water capacity at a minimum of once every hour. In other words, the entire contents of the hot tub must pass through the filters 24 times a day. This is all about safety, both for the consumer and for the equipment.

Spa cartridges are not paper, but are made with a special spun bonded, non-woven media. This material is 100 percent polyester fibre and does not contain any resins or binders, which could break down over time. In addition, the fabric is rot and mildew resistant.

FYI:
The Mistral Micro-Clean System will create suction through the filter ranging from 20-30 gallons per minute leaving a very healthy margin for the filter. In regards to National Sanitation Foundation certification, the NSF allows a flow rate of 1 GPM for residential pools and .375 GPM on commercial installations. Unicel filters are rated at a maximum flow rate of 1 gallon/min. per square foot of filter. So a 50 Square foot Unicel filter has a maximum flow capacity of 50 GPM.

While cartridge filters can work at any flow rate, generally speaking, the lower the flow per square foot, the more efficient the system works given that there is enough agitation periodically to stir things up.

Circulation Systems
	2-SPEED CIRCULATION SYSTEMS The standard heating and filtration system uses the low speed of the 2-speed jet pump for heating and filtration. This design allows the customer to choose the duration of the filtration cycle.
SILENT FLOW CIRCULATION SYSTEMS The optional Tidal wave pump is recommended for the consumer that wants continuous filtration with the benefits of noise reduction and energy efficiency. In this design the 2-speed jet pump is used solely for massage therapy.
	AQUA-STEALTH CIRCULATION SYSTEMS The Aqua-Stealth system is designed for the customer who wants the most advanced heating and filtration system in the industry. The Aqua-Stealth system incorporates three components. The quiet Aqua-Stealth 24 hour circulation pump, a calcium resistant heating chamber and double the filtration of our standard 2-speed pump system. The result is lower operating costs, less water treatment products and crystal clear water every time you use your Mistral Hot Tub.
AQUA-FLO MASTER (XP3) PUMP The XP3 Pump is designed to provide increased performance through efficiency rather than brute force. The XP3 Pump is a lower amp pump that allows you to enjoy the same flow rates received from a higher amp pump. Making the spa more energy efficient and reducing consumer operating costs.