REPLACE YOUR POOL FILTER SAND
With A Sustainable Alternative Media
How To Install Glass Media
To replace pool sand in a fiberglass filter with recycled glass media:
1. It is advisable to have an initial and level of water within the unit that just covers the underdrain system. This helps protect the nozzles from possible direct impact damage when installing recycled glass media from the top.
2. New GRP filter units and older units with underdrains/nozzles in excellent condition can be loaded with just two grades.
Plastic nozzle systems can degrade or become damaged over time. Old or damaged nozzles could possibly allow small quantities of any media material to pass into the pool waters. As with any form of media material, this is undesirable. However, it is simply indicative of the need to replace the defective part/s of the underdrain system. If such a leakage should occur, the media does not present a health or safety hazard in any way. Of course, remedial action must be taken ASAP by a PROFESSIONAL POOL ENGINEER.
If unsure of the underdrain condition, then simply replace 50% of the calculated Grade 2 loading with an equivalent amount of Grade 3 as the bottom layer. Next, add the balance of Grade 2. Finally, load the full calculated quantity of Grade 1. This will help protect the nozzles.
Typical GRP Pool filter size loadings:
1.20 m. diam: Approx 59 x 20 kg bags - 1200 kg Grade 1 & 255 kg Grade 2
1.40 m. diam: Approx 72 x 25 kg bags - 1400 kg Grade 1 & 390 kg Grade 2
1.60 m. diam: Approx 95 x 25 kg bags - 1800 kg Grade 1 & 575 kg Grade 2
1.80 m. diam: Approx 122 x 25 kg bags - 2400 kg Grade 1 & 650 kg Grade 2
PERCENTAGE LOADING BY WEIGHT:
The grade loading breakdown by percentage of any given total weight for installation in most GRP pool filter units will approximately be as follows:
All new GRP filters and those with nozzle underdrain systems in excellent condition:
Bottom layer: 20% -30% Grade 2
Top layer 70% - 80% Grade 1
For older units, 50% of the Grade 2 loading can be replaced with Grade 3 as detailed above.