CREATE TABLESPACE ts1 LOCATION '/data/disk2';

CREATE TABLE new_tbl
TABLESPACE ts1 AS
SELECT * FROM tbl
ORDER BY ....  -- ORDER BY is optional

ALTER TABLE tbl SET TABLESPACE pg_default

COPY tbl TO '/path/to/other/disk/tbl.pgsql';
TRUNCATE tbl;
COPY tbl FROM '/path/to/other/disk/tbl.pgsql';

pg93@db-172-16-3-150-> psql
psql (9.3.3)
Type "help" for help.

digoal=# create table t_bloat(id int primary key, info text, crt_time timestamp);
CREATE TABLE
digoal=# insert into t_bloat select generate_series(1,100000),md5(random()::text),clock_timestamp();
INSERT 0 100000
digoal=# delete from t_bloat where id<>100000;
DELETE 99999
digoal=# vacuum t_bloat;
VACUUM
digoal=# vacuum t_bloat;
VACUUM
digoal=# select relpages from pg_class where relname='t_bloat';
 relpages
----------
      233
(1 row)

digoal=# insert into t_bloat select generate_series(1,100),md5(random()::text),clock_timestamp();
INSERT 0 100
digoal=# select split_part(ctid::text,',',1) from t_bloat group by 1;
 split_part
------------
 (0
 (232
(2 rows)

digoal=# begin;
BEGIN
digoal=# create temp table t_bloat_tmp(like t_bloat);
CREATE TABLE
digoal=# insert into t_bloat_tmp select * from t_bloat where split_part(ctid::text,',',1)='(232';
INSERT 0 1
digoal=# delete from t_bloat where split_part(ctid::text,',',1)='(232';
DELETE 1
digoal=# insert into t_bloat select * from t_bloat_tmp ;
INSERT 0 1
digoal=# end;
COMMIT
digoal=# vacuum t_bloat;
VACUUM
digoal=# select split_part(ctid::text,',',1) from t_bloat group by 1;
 split_part
------------
 (0
 (1
(2 rows)

digoal=# select relpages from pg_class where relname='t_bloat';
 relpages
----------
        2
(1 row)