Replacing The Media - Netafim SANDSTORM User Manual

MAINTENANCE

Replacing the media

WARNING
Do not perform maintenance operations or open filter ports before the pressure in the system is
fully released. For draining purposes, open any valve downstream from the filtration system until
the pressure is fully released. Check the pressure gauge to be sure it is at 0 before proceeding.
The sand media usually requires replacement every 3 to 5 years, depending on water quality and how
much the system operates.
1. Close all the valves, open the top and bottom service ports of all the tanks and remove their covers.
2. Drain and flush all the media from the tank.
CAUTION
Do not use tools to help remove the media - under-drain diffusers ("flutes" or "mushrooms") could
be damaged.
TIP
If the sand media is solidified inside the tank and does not pour out of the bottom service port by
itself, you can crumble it with pressurized water through the bottom service port.
3. Rinse and clean the inside of the tank.
4. Visually check (with the aid of a flashlight) the inside of all the tanks, through the filling port, for
damaged, missing or unsecured under-drain diffusers ("flutes" or "mushrooms"). Replace, re-fit, re-
connect and re-secure if necessary (See tank replacement parts: single-chamber -
chamber - page
5. Make sure that the bottom service port and its gasket are clear of any remaining gravel particles and
close the bottom service port.
ATTENTION
Single-chamber only
Before filling the tanks with media, Fill each tank with water up to a third of its height with a hose
through the filling port before media filling to prevent damage to the under-drain diffusers when
pouring the media.
6. Fill the tanks with media through the filling port. Fill each tank up to the media level marker on the filter tank.
Single-chamber
Tank diameter Sand quantity*
(inch)
30
36
48
*Crushed basalt.
7. Flatten the surface of the media.
14 SANDSTORM SINGLE-/DOUBLE-CHAMBER USER MANUAL
™
22).
Double-chamber
Tank diameter
kg lbs
270 595
350 770
675 1490
Sand quantity*
(inch)
kg
12 60
16 90
20 120
24 180
30 240
36 360
48 575 1768
page
lbs
132
198
265
397
529
794
20, double-