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Revision date: 03.21.18
115295
AERATION SYSTEM — CUSTOMER-SUPPLIED AIR MANIFOLD WEIGHTS
The air supply manifolds in raft bed are buoyant, especially when air pump is operating. To
keep manifold firmly in place at bottom of raft bed during operation, construct water-tight
weights (using customer-supplied materials) and attach to each manifold throughout their
lengths. Here is one suggestion for constructing customer-supplied air manifold weights. See
suggested customer-supplied materials list at the right.
Suggested parts to construct
customer-supplied
weights
for raft bed air manifolds:
• 1/2" PVC Pipe in 10' Lengths
• 1/2" PVC Slip Caps
• 1/2" reinforcing bar (rebar)
• Plastic Cable Ties
• PVC Primer and Glue to seal tubes.
Complete these steps:
1. Take a 5' stick of 1/2" PVC pipe and slide a 5' length of 1/2" rebar inside it.
2. Using PVC primer, glue, and 1/2" PVC end caps, seal rebar inside PVC pipe. Allow to dry.
3. Carefully place weight along one air manifold between air
stones, or on top of tube.
4. Secure weight to manifold using a few plastic cable ties.
5. Repeat to create additional weights as needed. Use one (1)
5' weight for each main tube of each air stone manifold.
rebar inside PVC pipe
rebar inside PVC pipe
1/2" PVC Slip Cap
ATTENTION:
When purchasing rebar and PVC
to construct weights, check that rebar actually fits
inside PVC pipe
before purchasing
. Increase PVC
size as needed to allow 1/2" rebar to fit inside.
CUSTOMER-SUPPLIED MATERIALS
Aeration System
plastic tie
Customer-Supplied PVC Weight
Top View of Raft Bed
Diagram shows top view of raft bed with installed air
system and customer-supplied PVC weights.
10c