Freshwater™ Phosphate Test Strips Calcium Increaser Hoyle™ Waterproof Clear Playing Cards

Hoyle™ Waterproof Clear Playing Cards are ultra-durable

restoring water clarity without affecting the chemical balance of your hot tub

Freshwater Clean Screen will NOT filter out phosphates though

then fully drain hot tub or swim spa

Add to spa water to prevent filter clogging and build-up and reduce maintenance

Freshwater™ Phosphate Test Strips Calcium Increaser Hoyle™ Waterproof Clear Playing CardsFreshWater Phosphate Test Strips provide quick and reliable way to test your hot tub water for phosphates. High amounts of phosphates in your hot tub will create an environment that algae likes to grow in. It can be difficult to keep a residual level of free available chlorine or bromine in your spa when there are significant amounts of phosphates in the water. Test instructions are on the bottle, along with a color chart. Contains 25 test strips.